关于上述二(er)(er)(er)极(ji)(ji)管(guan)(guan)(guan)简易直(zhi)流电(dian)(dian)(dian)(dian)压(ya)稳压(ya)电(dian)(dian)(dian)(dian)路(lu)分(fen)析(xi)(xi)(xi)细节说(shuo)明如下。（1）在电(dian)(dian)(dian)(dian)路(lu)分(fen)析(xi)(xi)(xi)中(zhong)(zhong)，利用二(er)(er)(er)极(ji)(ji)管(guan)(guan)(guan)的(de)单向导(dao)(dao)电(dian)(dian)(dian)(dian)性(xing)可以(yi)(yi)(yi)知道二(er)(er)(er)极(ji)(ji)管(guan)(guan)(guan)处于导(dao)(dao)通(tong)(tong)状态，但是(shi)并不能(neng)说(shuo)明这(zhei)几只(zhi)二(er)(er)(er)极(ji)(ji)管(guan)(guan)(guan)导(dao)(dao)通(tong)(tong)后对电(dian)(dian)(dian)(dian)路(lu)有什么具体作(zuo)用，所(suo)(suo)以(yi)(yi)(yi)只(zhi)利用单向导(dao)(dao)电(dian)(dian)(dian)(dian)特(te)(te)(te)性(xing)还不能(neng)够(gou)正确分(fen)析(xi)(xi)(xi)电(dian)(dian)(dian)(dian)路(lu)工(gong)作(zuo)原理(li)。（2）二(er)(er)(er)极(ji)(ji)管(guan)(guan)(guan)众(zhong)多(duo)的(de)特(te)(te)(te)性(xing)中(zhong)(zhong)只(zhi)有导(dao)(dao)通(tong)(tong)后管(guan)(guan)(guan)压(ya)降基本不变这(zhei)一特(te)(te)(te)性(xing)能(neng)够(gou)为合理(li)地解释这(zhei)一电(dian)(dian)(dian)(dian)路(lu)的(de)作(zuo)用，所(suo)(suo)以(yi)(yi)(yi)依据这(zhei)一点可以(yi)(yi)(yi)确定(ding)这(zhei)一电(dian)(dian)(dian)(dian)路(lu)是(shi)为了稳定(ding)电(dian)(dian)(dian)(dian)路(lu)中(zhong)(zhong)A点的(de)直(zhi)流工(gong)作(zuo)电(dian)(dian)(dian)(dian)压(ya)。（3）电(dian)(dian)(dian)(dian)路(lu)中(zhong)(zhong)有多(duo)只(zhi)元器(qi)件时，一定(ding)要设(she)法搞清楚(chu)实现电(dian)(dian)(dian)(dian)路(lu)功(gong)能(neng)的(de)主要元器(qi)件，然后围绕它进行(xing)展开分(fen)析(xi)(xi)(xi)。分(fen)析(xi)(xi)(xi)中(zhong)(zhong)运用该元器(qi)件主要特(te)(te)(te)性(xing)，进行(xing)合理(li)解释。西藏ESD二(er)(er)(er)极(ji)(ji)管(guan)(guan)(guan)厂家就找成都长九电(dian)(dian)(dian)(dian)子科技有限公司(si)。重(zhong)庆静电(dian)(dian)(dian)(dian)保(bao)护二(er)(er)(er)极(ji)(ji)管(guan)(guan)(guan)购买联系(xi)电(dian)(dian)(dian)(dian)话

ALC电(dian)(dian)(dian)路(lu)在录(lu)(lu)音(yin)机、卡座的(de)(de)录(lu)(lu)音(yin)卡中，录(lu)(lu)音(yin)时要(yao)(yao)(yao)对(dui)录(lu)(lu)音(yin)信(xin)(xin)号(hao)(hao)的(de)(de)大(da)(da)小(xiao)幅(fu)度(du)进(jin)行控制(zhi)(zhi)，了解下列几点(dian)具体(ti)的(de)(de)控制(zhi)(zhi)要(yao)(yao)(yao)求(qiu)(qiu)有助于(yu)分析二(er)极(ji)管(guan)VD1自动控制(zhi)(zhi)电(dian)(dian)(dian)路(lu)。（1）在录(lu)(lu)音(yin)信(xin)(xin)号(hao)(hao)幅(fu)度(du)较(jiao)小(xiao)时，不控制(zhi)(zhi)录(lu)(lu)音(yin)信(xin)(xin)号(hao)(hao)的(de)(de)幅(fu)度(du)。（2）当录(lu)(lu)音(yin)信(xin)(xin)号(hao)(hao)的(de)(de)幅(fu)度(du)大(da)(da)到一(yi)定程度(du)后，开始(shi)对(dui)录(lu)(lu)音(yin)信(xin)(xin)号(hao)(hao)幅(fu)度(du)进(jin)行控制(zhi)(zhi)，即(ji)对(dui)信(xin)(xin)号(hao)(hao)幅(fu)度(du)进(jin)行衰减，对(dui)录(lu)(lu)音(yin)信(xin)(xin)号(hao)(hao)幅(fu)度(du)控制(zhi)(zhi)的(de)(de)电(dian)(dian)(dian)路(lu)就是ALC电(dian)(dian)(dian)路(lu)。（3）ALC电(dian)(dian)(dian)路(lu)进(jin)入控制(zhi)(zhi)状(zhuang)态后，要(yao)(yao)(yao)求(qiu)(qiu)录(lu)(lu)音(yin)信(xin)(xin)号(hao)(hao)愈大(da)(da)，对(dui)信(xin)(xin)号(hao)(hao)的(de)(de)衰减量愈大(da)(da)。通过上述说明可知，电(dian)(dian)(dian)路(lu)分析中要(yao)(yao)(yao)求(qiu)(qiu)自己有比较(jiao)的(de)(de)知识(shi)面，这需要(yao)(yao)(yao)在不断的(de)(de)学习中日(ri)积月累。重庆静(jing)电(dian)(dian)(dian)保护二(er)极(ji)管(guan)购买联系(xi)电(dian)(dian)(dian)话西(xi)藏保护二(er)极(ji)管(guan)厂家(jia)就找成都长九电(dian)(dian)(dian)子科(ke)技有限公(gong)司。

控(kong)(kong)(kong)(kong)制(zhi)电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)的(de)(de)一般分(fen)析方法(fa)说明对于(yu)控(kong)(kong)(kong)(kong)制(zhi)电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)的(de)(de)分(fen)析通(tong)(tong)常要(yao)分(fen)成多种情况(kuang)，例(li)如将控(kong)(kong)(kong)(kong)制(zhi)信(xin)(xin)(xin)号分(fen)成大(da)(da)(da)、中(zhong)(zhong)(zhong)、小(xiao)等几(ji)种情况(kuang)。就这一电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)而言，控(kong)(kong)(kong)(kong)制(zhi)电(dian)(dian)(dian)(dian)压(ya)Ui对二(er)(er)(er)极(ji)(ji)管(guan)(guan)VD1的(de)(de)控(kong)(kong)(kong)(kong)制(zhi)要(yao)分(fen)成下列几(ji)种情况(kuang)。（1）电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)中(zhong)(zhong)(zhong)没(mei)(mei)有录(lu)(lu)(lu)音(yin)(yin)信(xin)(xin)(xin)号时，直流(liu)控(kong)(kong)(kong)(kong)制(zhi)电(dian)(dian)(dian)(dian)压(ya)Ui为0，二(er)(er)(er)极(ji)(ji)管(guan)(guan)VD1截止(zhi)，VD1对电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)工作无影响，级(ji)录(lu)(lu)(lu)音(yin)(yin)放(fang)(fang)大(da)(da)(da)器输(shu)(shu)出(chu)的(de)(de)信(xin)(xin)(xin)号可(ke)以(yi)全部加到(dao)第二(er)(er)(er)级(ji)录(lu)(lu)(lu)音(yin)(yin)放(fang)(fang)大(da)(da)(da)器中(zhong)(zhong)(zhong)。（2）当电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)中(zhong)(zhong)(zhong)的(de)(de)录(lu)(lu)(lu)音(yin)(yin)信(xin)(xin)(xin)号较(jiao)小(xiao)时，直流(liu)控(kong)(kong)(kong)(kong)制(zhi)电(dian)(dian)(dian)(dian)压(ya)Ui较(jiao)小(xiao)，没(mei)(mei)有大(da)(da)(da)于(yu)二(er)(er)(er)极(ji)(ji)管(guan)(guan)VD1的(de)(de)导(dao)(dao)通(tong)(tong)电(dian)(dian)(dian)(dian)压(ya)，所以(yi)不足以(yi)使二(er)(er)(er)极(ji)(ji)管(guan)(guan)VD1导(dao)(dao)通(tong)(tong)，此时二(er)(er)(er)极(ji)(ji)管(guan)(guan)VD1对级(ji)录(lu)(lu)(lu)音(yin)(yin)放(fang)(fang)大(da)(da)(da)器输(shu)(shu)出(chu)的(de)(de)信(xin)(xin)(xin)号也(ye)没(mei)(mei)有分(fen)流(liu)作用。（3）当电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)中(zhong)(zhong)(zhong)的(de)(de)录(lu)(lu)(lu)音(yin)(yin)信(xin)(xin)(xin)号比较(jiao)大(da)(da)(da)时，直流(liu)控(kong)(kong)(kong)(kong)制(zhi)电(dian)(dian)(dian)(dian)压(ya)Ui较(jiao)大(da)(da)(da)，使二(er)(er)(er)极(ji)(ji)管(guan)(guan)VD1导(dao)(dao)通(tong)(tong)，录(lu)(lu)(lu)音(yin)(yin)信(xin)(xin)(xin)号愈(yu)大(da)(da)(da)，直流(liu)控(kong)(kong)(kong)(kong)制(zhi)电(dian)(dian)(dian)(dian)压(ya)Ui愈(yu)大(da)(da)(da)，VD1导(dao)(dao)通(tong)(tong)程度愈(yu)深，VD1的(de)(de)内阻愈(yu)小(xiao)。（4）VD1导(dao)(dao)通(tong)(tong)后(hou)，VD1的(de)(de)内阻下降(jiang)，级(ji)录(lu)(lu)(lu)音(yin)(yin)放(fang)(fang)大(da)(da)(da)器输(shu)(shu)出(chu)的(de)(de)录(lu)(lu)(lu)音(yin)(yin)信(xin)(xin)(xin)号中(zhong)(zhong)(zhong)的(de)(de)一部分(fen)通(tong)(tong)过电(dian)(dian)(dian)(dian)容C1和导(dao)(dao)通(tong)(tong)的(de)(de)二(er)(er)(er)极(ji)(ji)管(guan)(guan)VD1被(bei)分(fen)流(liu)到(dao)地端，VD1导(dao)(dao)通(tong)(tong)愈(yu)深，它的(de)(de)内阻愈(yu)小(xiao)，对级(ji)录(lu)(lu)(lu)音(yin)(yin)放(fang)(fang)大(da)(da)(da)器输(shu)(shu)出(chu)信(xin)(xin)(xin)号的(de)(de)对地分(fen)流(liu)量愈(yu)大(da)(da)(da)，实现自动电(dian)(dian)(dian)(dian)平控(kong)(kong)(kong)(kong)制(zhi)。

电(dian)(dian)(dian)(dian)(dian)路分析准(zhun)备知(zhi)识(shi)说(shuo)(shuo)明二极管(guan)的单向(xiang)导(dao)电(dian)(dian)(dian)(dian)(dian)特性只(zhi)是说(shuo)(shuo)明了(le)正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)小(xiao)、反向(xiang)电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)大(da)(da)，没有说(shuo)(shuo)明二极管(guan)导(dao)通(tong)后(hou)(hou)还(hai)有哪些具体的特性。二极管(guan)正(zheng)向(xiang)导(dao)通(tong)之(zhi)后(hou)(hou)，它的正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)大(da)(da)小(xiao)还(hai)与(yu)流(liu)(liu)过二极管(guan)的正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大(da)(da)小(xiao)相(xiang)关。尽管(guan)二极管(guan)正(zheng)向(xiang)导(dao)通(tong)后(hou)(hou)的正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)比较小(xiao)（相(xiang)对(dui)反向(xiang)电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)而言），但(dan)是如果增加正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，二极管(guan)导(dao)通(tong)后(hou)(hou)的正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)还(hai)会进一步下降，即正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)愈大(da)(da)，正(zheng)向(xiang)电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)愈小(xiao)，反之(zhi)则大(da)(da)。不(bu)熟悉电(dian)(dian)(dian)(dian)(dian)路功(gong)能(neng)对(dui)电(dian)(dian)(dian)(dian)(dian)路工作原(yuan)理(li)很不(bu)利，在(zai)了(le)解(jie)电(dian)(dian)(dian)(dian)(dian)路功(gong)能(neng)的背景下能(neng)有的放矢地分析电(dian)(dian)(dian)(dian)(dian)路工作原(yuan)理(li)或电(dian)(dian)(dian)(dian)(dian)路中某元器件的作用。ALC电(dian)(dian)(dian)(dian)(dian)路在(zai)录音(yin)机、卡座的录音(yin)卡中，录音(yin)时要对(dui)录音(yin)信号的大(da)(da)小(xiao)幅(fu)度进行控制，了(le)解(jie)下列几点具体的控制要求有助于(yu)分析二极管(guan)VD1自动控制电(dian)(dian)(dian)(dian)(dian)路。重庆汽车电(dian)(dian)(dian)(dian)(dian)子TVS二极管(guan)厂家就找成都长九(jiu)电(dian)(dian)(dian)(dian)(dian)子科(ke)技有限公司。

1.整(zheng)流(liu)整(zheng)流(liu)二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)主要(yao)(yao)用(yong)(yong)(yong)(yong)于(yu)整(zheng)流(liu)电(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)，即把交流(liu)电(dian)(dian)(dian)(dian)(dian)变换成(cheng)(cheng)脉动的(de)(de)(de)直流(liu)电(dian)(dian)(dian)(dian)(dian)。整(zheng)流(liu)二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)都(dou)是(shi)面结型(xing)，因此结电(dian)(dian)(dian)(dian)(dian)容较(jiao)大(da)，使(shi)其(qi)工作频(pin)(pin)率较(jiao)低(di)(di)，一般(ban)为(wei)3kHZ以(yi)下。2.开(kai)关(guan)二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)在(zai)(zai)(zai)正向(xiang)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)作用(yong)(yong)(yong)(yong)下电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)很小，处于(yu)导(dao)通(tong)状(zhuang)态，相当于(yu)一只接通(tong)的(de)(de)(de)开(kai)关(guan)；在(zai)(zai)(zai)反(fan)向(xiang)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)作用(yong)(yong)(yong)(yong)下，电(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)很大(da)，处于(yu)截(jie)止状(zhuang)态，如同一只断开(kai)的(de)(de)(de)开(kai)关(guan)。利用(yong)(yong)(yong)(yong)二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)的(de)(de)(de)开(kai)关(guan)特(te)性，可以(yi)组成(cheng)(cheng)各种逻辑电(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)。3.限(xian)幅二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)正向(xiang)导(dao)通(tong)后，它的(de)(de)(de)正向(xiang)压(ya)(ya)降(jiang)基本保(bao)持(chi)不变（硅管(guan)(guan)(guan)为(wei)，锗管(guan)(guan)(guan)为(wei)）。利用(yong)(yong)(yong)(yong)这(zhei)一特(te)性，在(zai)(zai)(zai)电(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)中(zhong)(zhong)(zhong)作为(wei)限(xian)幅元件，可以(yi)把信号(hao)幅度限(xian)制在(zai)(zai)(zai)一定(ding)范围内。4.续流(liu)在(zai)(zai)(zai)开(kai)关(guan)电(dian)(dian)(dian)(dian)(dian)源的(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)感中(zhong)(zhong)(zhong)和(he)继电(dian)(dian)(dian)(dian)(dian)器等(deng)感性负载中(zhong)(zhong)(zhong)起续流(liu)作用(yong)(yong)(yong)(yong)。5.检波检波二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)的(de)(de)(de)主要(yao)(yao)作用(yong)(yong)(yong)(yong)是(shi)把高(gao)频(pin)(pin)信号(hao)中(zhong)(zhong)(zhong)的(de)(de)(de)低(di)(di)频(pin)(pin)信号(hao)检出(chu)。它们(men)的(de)(de)(de)结构为(wei)点接触(chu)(chu)型(xing)。其(qi)结电(dian)(dian)(dian)(dian)(dian)容较(jiao)小，工作频(pin)(pin)率较(jiao)高(gao)，一般(ban)都(dou)采用(yong)(yong)(yong)(yong)锗材(cai)料(liao)制成(cheng)(cheng)。6.阻(zu)(zu)(zu)尼阻(zu)(zu)(zu)尼二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)多用(yong)(yong)(yong)(yong)在(zai)(zai)(zai)高(gao)频(pin)(pin)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)电(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)中(zhong)(zhong)(zhong)，能承(cheng)受较(jiao)高(gao)的(de)(de)(de)反(fan)向(xiang)击(ji)穿(chuan)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)和(he)较(jiao)大(da)的(de)(de)(de)峰值电(dian)(dian)(dian)(dian)(dian)流(liu)，一般(ban)用(yong)(yong)(yong)(yong)在(zai)(zai)(zai)电(dian)(dian)(dian)(dian)(dian)视机电(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)中(zhong)(zhong)(zhong)，常(chang)用(yong)(yong)(yong)(yong)的(de)(de)(de)阻(zu)(zu)(zu)尼二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)有(you)2CN1、2CN2、BSBS44等(deng)。7.显示用(yong)(yong)(yong)(yong)于(yu)VCD、DVD、计算(suan)器等(deng)显示器上。8.稳压(ya)(ya)这(zhei)种管(guan)(guan)(guan)子(zi)是(shi)利用(yong)(yong)(yong)(yong)二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)的(de)(de)(de)反(fan)向(xiang)击(ji)穿(chuan)特(te)性制成(cheng)(cheng)的(de)(de)(de)，在(zai)(zai)(zai)电(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)中(zhong)(zhong)(zhong)其(qi)两(liang)端的(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)保(bao)持(chi)基本不变，起到稳定(ding)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)的(de)(de)(de)作用(yong)(yong)(yong)(yong)。常(chang)用(yong)(yong)(yong)(yong)的(de)(de)(de)稳压(ya)(ya)管(guan)(guan)(guan)有(you)2CW55、2CW56等(deng)。9.触(chu)(chu)发(fa)触(chu)(chu)发(fa)二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)又称双向(xiang)触(chu)(chu)发(fa)二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)。重庆车(che)规二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)厂家就找成(cheng)(cheng)都(dou)长九电(dian)(dian)(dian)(dian)(dian)子(zi)科技(ji)有(you)限(xian)公司。成(cheng)(cheng)都(dou)车(che)规二(er)(er)(er)极(ji)(ji)(ji)管(guan)(guan)(guan)厂商

西(xi)藏静电保(bao)(bao)护二(er)极管(guan)(guan)厂家就找(zhao)成(cheng)都长九电子(zi)科技有(you)限公司。重庆静电保(bao)(bao)护二(er)极管(guan)(guan)购买联系电话

检波(bo)(bo)电(dian)(dian)(dian)路(lu)(lu)输出(chu)信(xin)号(hao)(hao)的(de)(de)平(ping)均值是直(zhi)流成(cheng)分，它的(de)(de)大(da)小表示(shi)了检波(bo)(bo)电(dian)(dian)(dian)路(lu)(lu)输出(chu)信(xin)号(hao)(hao)的(de)(de)平(ping)均幅值大(da)小，检波(bo)(bo)电(dian)(dian)(dian)路(lu)(lu)输出(chu)信(xin)号(hao)(hao)幅度(du)大(da)，其平(ping)均值大(da)，这(zhei)一直(zhi)流电(dian)(dian)(dian)压(ya)值就大(da)，反之则小。这(zhei)一直(zhi)流成(cheng)分在收音机电(dian)(dian)(dian)路(lu)(lu)中用来(lai)控制(zhi)一种称为(wei)中频(pin)(pin)放(fang)大(da)器(qi)(qi)的(de)(de)放(fang)大(da)倍数（也可以(yi)称为(wei)增益），称为(wei)AGC（自动增益控制(zhi)）电(dian)(dian)(dian)压(ya)。AGC电(dian)(dian)(dian)压(ya)被(bei)检波(bo)(bo)电(dian)(dian)(dian)路(lu)(lu)输出(chu)端耦合电(dian)(dian)(dian)容(rong)隔(ge)离，不能与音频(pin)(pin)信(xin)号(hao)(hao)一起加(jia)到后级放(fang)大(da)器(qi)(qi)电(dian)(dian)(dian)路(lu)(lu)中，而是专门(men)加(jia)到AGC电(dian)(dian)(dian)路(lu)(lu)中。检波(bo)(bo)电(dian)(dian)(dian)路(lu)(lu)输出(chu)信(xin)号(hao)(hao)中还有高频(pin)(pin)载波(bo)(bo)信(xin)号(hao)(hao)，这(zhei)一信(xin)号(hao)(hao)无用，通过接在检波(bo)(bo)电(dian)(dian)(dian)路(lu)(lu)输出(chu)端的(de)(de)高频(pin)(pin)滤波(bo)(bo)电(dian)(dian)(dian)容(rong)C1，被(bei)滤波(bo)(bo)到地端。重庆(qing)静电(dian)(dian)(dian)保护二极管购买联系(xi)电(dian)(dian)(dian)话

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