母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)和母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)其实就(jiu)是(shi)一个封(feng)(feng)闭(bi)(bi)(bi)一个不封(feng)(feng)闭(bi)(bi)(bi)。封(feng)(feng)闭(bi)(bi)(bi)式(shi)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)简称(cheng)是(shi)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)，也就(jiu)是(shi)说母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)是(shi)封(feng)(feng)闭(bi)(bi)(bi)式(shi)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)马(ma)甲，封(feng)(feng)闭(bi)(bi)(bi)式(shi)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)和母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)指的(de)(de)都(dou)是(shi)同一种东西，树(shu)上(shang)鸟教育电(dian)(dian)(dian)气(qi)设(she)计在线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)教学狄老师。封(feng)(feng)闭(bi)(bi)(bi)式(shi)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)是(shi)由(you)金(jin)属板（钢板或铝板）为(wei)保(bao)护外壳(qiao)、导(dao)电(dian)(dian)(dian)排、绝缘材料及有(you)关附(fu)件组成的(de)(de)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)系统(tong)。它可制(zhi)成每隔一段距离设(she)有(you)插接分线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)盒(he)的(de)(de)插接型封(feng)(feng)闭(bi)(bi)(bi)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)，也可制(zhi)成中间不带分线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)盒(he)的(de)(de)馈电(dian)(dian)(dian)型封(feng)(feng)闭(bi)(bi)(bi)式(shi)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)。是(shi)将主母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)采用(yong)金(jin)属外壳(qiao)封(feng)(feng)闭(bi)(bi)(bi)的(de)(de)母(mu)(mu)(mu)(mu)线(xian)(xian)(xian)(xian)(xian)(xian)(xian)(xian)。