4zhvml8 发表于 2024-8-31 05:45:16

通信电源：为么用-48V你晓得吗？


    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">通信</span>电源是通信系统必不可少的重要<span style="color: black;">构成</span>部分，其设计<span style="color: black;">目的</span>是安全、<span style="color: black;">靠谱</span>、<span style="color: black;">有效</span>、稳定、不间断地向通信设备<span style="color: black;">供给</span>能源。通信电源必须具备智能集散监控、无人值守和电池自动管理等功能，从而满足网络时代的<span style="color: black;">需要</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">在我国，通信电源大部分都是<span style="color: black;">运用</span>-48V供电，<span style="color: black;">做为</span>通信人，你<span style="color: black;">晓得</span><span style="color: black;">为何</span>吗？</span></strong>在解开这个疑问之前，<span style="color: black;">咱们</span>先来<span style="color: black;">认识</span>一下-48V电源是怎么来的吧！</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;">-48V电源是<span style="color: black;">怎样</span>产生的？</span></span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">如<span style="color: black;">咱们</span>所知，通信设备的供电电源<span style="color: black;">能够</span>是交流电源或直流电源，要实现电源的不间断供电，除了UPS（Uninterruptible Power Supply，不间断电源）之外，就必须依赖蓄电池储存的电能了，而监控模块负责<span style="color: black;">全部</span>系统的管理，并将数据传输到远程监控终端。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">通信电源的基本<span style="color: black;">需求</span>和特点：对通信电源系统的基本<span style="color: black;">需求</span>是<span style="color: black;">靠谱</span>性和稳定性。<span style="color: black;">通常</span>通信设备<span style="color: black;">出现</span>故障的影响面较小，是局部性的，但<span style="color: black;">倘若</span>通信电源系统一旦<span style="color: black;">出现</span>故障，通信系统将<span style="color: black;">所有</span>中断，<span style="color: black;">因此</span>电源系统要有备份设备，电源设备要有备品备件，市电要有双路或多路输入，交流和直流互为备用。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">下面以市电为例，介绍通信电源系统是如何工作的。</p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-axegupay5k/32157af0b97a4de5a04e252ae08f8432~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=NKgCEkIAYVk%2FrwogR0h5qQT5LIk%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">从上图可看出，<strong style="color: blue;"><span style="color: black;">-48V电源<span style="color: black;">便是</span><span style="color: black;">经过</span>整流模块将交流电或高压直流电转换而来。</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">这儿</span>多讲一句，关于市电的<span style="color: black;">归类</span>——</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">*一类市电供电为从两个稳定<span style="color: black;">靠谱</span>的独立电源各自引入一路供电线。该两路<span style="color: black;">不该</span><span style="color: black;">同期</span><span style="color: black;">显现</span>检修停电，平均每月停电次数<span style="color: black;">不该</span>大于1次，平均每次故障时间<span style="color: black;">不该</span>大于0.5h。两路供电线宜配置备用市电电源自动投入<span style="color: black;">安装</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">*二类市电供电线路<span style="color: black;">准许</span>有计划检修停电，平均每月停电次数<span style="color: black;">不该</span>大于3.5次，平均每次故障时间<span style="color: black;">不该</span>大于6h。供电应符合下列<span style="color: black;">要求</span>之一的<span style="color: black;">需求</span>：</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a.由两个以上独立电源<span style="color: black;">形成</span>稳定<span style="color: black;">靠谱</span>的环形网上引入一路供电线。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">b.由一个稳定<span style="color: black;">靠谱</span>的独立电源或从稳定<span style="color: black;">靠谱</span>的输电线路上引入一路供电线。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">*三类市电供电为从一个电源引入一路供电线，供电线路长、用户多、平均每月停电次数<span style="color: black;">不该</span>大于4.5次，平均每次故障时间<span style="color: black;">不该</span>大于8h。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">*四类市电供电应符合下列<span style="color: black;">要求</span>之一的<span style="color: black;">需求</span>:</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a.由一个电源引入一路供电线，经常昼夜停电，供电无<span style="color: black;">保准</span>，达不到第三类市电供电<span style="color: black;">需求</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">b.有季节性<span style="color: black;">长期</span>停电或无市电可用。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;">为啥是-48V供电？</span></span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">但<span style="color: black;">非常多</span>人看到<span style="color: black;">这儿</span>就会打出一键三连的疑问，be like：</p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/0bd4dd83ecaf48e09e4853bf9d64f04c~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=wPqtZAyUuedpwfkC09vb7QqpD0M%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">通信电源<span style="color: black;">为何</span>要<span style="color: black;">运用</span>-48V的电压？其实这个<span style="color: black;">原由</span><span style="color: black;">重点</span><span style="color: black;">源自</span>于以下几个方面：</strong></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p26-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/210dea3235df4f1ba566eb9caff8ada9~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=Xpaaq7ZZ3p%2Bj8hPUgcDIGetzBAg%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">01.<strong style="color: blue;"><span style="color: black;">历史<span style="color: black;">原由</span></span></strong>：历史<span style="color: black;">运用</span>最早的通信设备如<span style="color: black;">tel</span>机，大多采用-48 V电压供电，通信电源由电信局供电。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">02.<strong style="color: blue;"><span style="color: black;">安全<span style="color: black;">原因</span></span></strong>：国际上定义直流电压-36V为安全电压，-48V比安全电压略高，线路的压降就会越小，在安全的<span style="color: black;">状况</span>下，<span style="color: black;">保准</span>市话有较远的通信距离。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">随着信息技术<span style="color: black;">持续</span>发展进步，为了兼容<span style="color: black;">初期</span>设备和降低成本的<span style="color: black;">思虑</span>，-48V电源<span style="color: black;">始终</span>沿用到<span style="color: black;">此刻</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">03.<strong style="color: blue;"><span style="color: black;">减少损耗</span></strong>：有利于电量的传输，能够减少电源用材损耗。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">高电压相<span style="color: black;">针对</span>低电压<span style="color: black;">来讲</span>，<span style="color: black;">运用</span>起来危险性要大。而低电压传输，<span style="color: black;">因为</span>相同功率的负载线路上的电流过大，需要减少线路电阻，<span style="color: black;">因此呢</span>要<span style="color: black;">选取</span>较粗的电源线，这将<span style="color: black;">引起</span>线路成本<span style="color: black;">增多</span>，<span style="color: black;">况且</span>还可能会影响通信系统的正常运行。</p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/31847044b7d7428cbe04a737ab351017~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=GgK2ksVnZ%2FRwVf1Ym9uHC2YTPM8%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">为何</span>是-48V而不是+48V？</strong></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/7aa6d748ec17428083f760205ffb9ebb~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=aNInN09AC%2FEWhzUfZzCF3RQFjDU%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">运用</span>-48V<span style="color: black;">重点</span>是<span style="color: black;">思虑</span>到通信设备的传输线介质的电化学特性，-48V极性为负，<span style="color: black;">亦</span><span style="color: black;">便是</span>正极接地。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">是<span style="color: black;">由于</span>通信设备<span style="color: black;">运用</span>直流电源，而空气中存在湿度，这就<span style="color: black;">引起</span>在直流电的电解<span style="color: black;">功效</span>下，设备正极会受到电解腐蚀。</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">而电源设备正极接地<span style="color: black;">能够</span>吸附空气中的<span style="color: black;">海量</span>负电荷，减少电源设备正极的腐蚀现象，从而<span style="color: black;">守护</span>电源设备的外壳不被锈蚀。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">-48V与+48V有什么区别？</strong></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/7ea5ea1d6ad64ae1bc155eb822422ebb~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=ZJB6rdvi7G5DjPoKAUKn3UCdcfI%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">-48V和+48V的电压相等，<strong style="color: blue;"><span style="color: black;">区别在于电流的走向。</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">运用</span>负电压是<span style="color: black;">因为</span>电子带负电，会向正电压的方向流动，从而避免<span style="color: black;">太多</span>的电子聚集在通信设备上，<span style="color: black;">从而</span>降低通信设备的故障率。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">48V<span style="color: black;">认识</span>了吧？！那-53.5V又是什么呢？</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">-53.5V是浮充电压，在<span style="color: black;">平常</span>供电时，电源需要对蓄电池进行浮充充电，<span style="color: black;">因此</span><span style="color: black;">实质</span>测出的电压为-53.5V。</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;"><span style="color: black;">全世界</span>都采用-48V电源系统吗？</span></span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">虽然我国通信电源供电采用-48V电源系统，但并不是所有的国家都是采用-48V电源系统，<span style="color: black;">例如</span>俄罗斯会采用-60V的电源系统，还有<span style="color: black;">有些</span>国家采用的是-24V电源系统。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">我国对通信电源的<span style="color: black;">需求</span>是：<strong style="color: blue;"><span style="color: black;">防雷<span style="color: black;">办法</span><span style="color: black;">需求</span>完善，设备<span style="color: black;">准许</span>的交流输入电压波动范围大，多重备用系统以防止电源系统<span style="color: black;">出现</span>电源完全中断故障。</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">因为</span>电网分布和利用市电的<span style="color: black;">要求</span>存在千差万别，许多<span style="color: black;">地区</span>的市电电压波动范围很大。<span style="color: black;">尤其</span>是<span style="color: black;">有些</span>变电站、微波站、光通信站、模块等，有时交流电压波动范围达±30％以上。为<span style="color: black;">加强</span>市电的可用度，<span style="color: black;">需求</span>电源设备<span style="color: black;">拥有</span>更宽的工作电压范围，否则就要<span style="color: black;">增多</span>稳压<span style="color: black;">安装</span>。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">因此呢</span>，<span style="color: black;">倘若</span><span style="color: black;">制品</span>要推广到其他<span style="color: black;">区别</span>供电系统的地区<span style="color: black;">运用</span>，就要兼顾这些地区的通信电源标准。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;">结语</span></span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">日前</span>，我国的移动用户数远超于固定用户数，群众更加<span style="color: black;">喜爱</span>于<span style="color: black;">运用</span>移动网络实现信息交流，对移动性与个性化的<span style="color: black;">需要</span>更加<span style="color: black;">明显</span>，移动通信慢慢转变为人们<span style="color: black;">重点</span>的信息交流途径。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">与过去相比，<span style="color: black;">近期</span>几年的通信市场更加活跃，信息技术的<span style="color: black;">广泛</span><span style="color: black;">提高</span>，<strong style="color: blue;"><span style="color: black;">5G通信技术的<span style="color: black;">显现</span><span style="color: black;">更加是</span>为<span style="color: black;">将来</span>通信行业的发展标明了方向，这<span style="color: black;">亦</span><span style="color: black;">引起</span>市场对5G技术人才的<span style="color: black;">需要</span>量越来越大。</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">大众</span>都<span style="color: black;">晓得</span>，5G网络优化工程师<span style="color: black;">重点</span>分为前台测试和后台优化，虽然都是同属于网络优化，<span style="color: black;">然则</span>职业发展以及薪资<span style="color: black;">薪水</span>确实天壤之别，在<span style="color: black;">这儿</span>咱们不对前台测试的岗位进行<span style="color: black;">太多</span>的赘述。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">5G网络优化后台工程师<span style="color: black;">重点</span>是<span style="color: black;">按照</span>测试结果，<span style="color: black;">根据</span>运营商的<span style="color: black;">需求</span>提出优化报告，经审核<span style="color: black;">准许</span>后进行网络优化，<span style="color: black;">处理</span>5G基站网络故障问题，进一步优化5G网络指标，<span style="color: black;">提高</span>5G网络性能。<span style="color: black;">因此</span>，只要存在移动通信网络，优化的工作<span style="color: black;">便是</span>不可避免的。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">5G网络优化后台工程师<span style="color: black;">通常</span>就是在当地运营商，联通，移动，电信大楼里面上班，比较稳定，<span style="color: black;">亦</span>是靠技术吃饭，工资<span style="color: black;">薪水</span><span style="color: black;">亦</span>非常可观。</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">长时间</span>发展<span style="color: black;">亦</span><span style="color: black;">能够</span>往高级网络优化工程师，专家，管理方向去发展，只要保持学习，<span style="color: black;">提高</span>技术，<span style="color: black;">将来</span>是非常有前景的。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">倘若</span>你是5G前台网优想进一步<span style="color: black;">提高</span>自己的技能，<span style="color: black;">或</span><span style="color: black;">日前</span>的工作<span style="color: black;">无</span>太大的发展前景，想要拓宽职业发展空间，优橙三个月就能带你逆袭成功。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">优橙教育的5G网络优化<span style="color: black;">基本</span>班+就业班的<span style="color: black;">教育</span>内容都是经过精心设计，<span style="color: black;">重点</span>是从5G通信<span style="color: black;">基本</span>入门，到<span style="color: black;">熟悉</span><span style="color: black;">把握</span>小区切换重选，5G-4G双网协同，5G覆盖和低CQI，再到活动<span style="color: black;">保证</span>，VoLTE/VoNR等，全面<span style="color: black;">把握</span>5G网络优化课程，<span style="color: black;">能够</span>胜任中级5G网络优化工程师、高级5G网络优化工程师等<span style="color: black;">关联</span>岗位。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">学员从优橙毕业后可从事以下工作岗位：<strong style="color: blue;"><span style="color: black;">5G网络优化工程师、后台网络优化工程师、华为IMC工程师。</span></strong></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/5901561ac10a4fe4bbf67909cf0628ea~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=UicAogOtTmc38NnBZppbPNOCs40%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">优橙<span style="color: black;">基本</span>班<span style="color: black;">教育</span>大纲</span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/b24bd30fb96e4f17a50ce4dd05a2845f~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1725628742&amp;x-signature=UqRataye%2BVMysNbXBpJ29%2BhEppM%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">优橙就业班部分<span style="color: black;">教育</span>大纲</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">几乎所有<span style="color: black;">公司</span>都只展示就业率，却几乎都不愿<span style="color: black;">颁布</span>毕业后<span style="color: black;">长时间</span>的从业率，恰恰毕业后<span style="color: black;">长时间</span>的从业数据<span style="color: black;">针对</span>学员才更有参考价值。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">优橙对每一位学员<span style="color: black;">长时间</span>跟踪，<span style="color: black;">日前</span>高达87%的学员，毕业一年后仍稳定从事5G<span style="color: black;">关联</span>工作。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">另外</span>，优橙还<span style="color: black;">持有</span>一套完善的就业跟踪体系，毕业上项目的两个月内，学员遇到问题，老师<span style="color: black;">经过</span>远程<span style="color: black;">帮助</span>或直接带着学员做；两个月之后，学员<span style="color: black;">已然</span>完全适应，再遇到问题，老师<span style="color: black;">供给</span>思路和难点答疑，学员独立自主完成。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;">针对</span><span style="color: black;">哪些</span>怀揣高薪梦想的职场人士<span style="color: black;">来讲</span>，<span style="color: black;">选取</span>一所合适的网优培训<span style="color: black;">公司</span>至关重要，优橙<span style="color: black;">亦</span>非常有幸能<span style="color: black;">作为</span>你们网优之路上的最佳合作伙伴。</span></strong></span></p>




j8typz 发表于 2024-10-21 11:53:55

期待与你深入交流，共探知识的无穷魅力。

m5k1umn 发表于 2024-10-30 09:33:40

一看到楼主的气势，我就觉得楼主同在社区里灌水。
页: [1]
查看完整版本: 通信电源：为么用-48V你晓得吗？