mr线缆---lekcbl10mmr /kr--lekcbl20m-mr中继用mrhgekcbl5mhg-

ekcbl5mkrhgl- -lekcbl10/用中继-线缆--mr-mrekcbl20mhg -mrmr

ekcbl10 用---mrekcbl20mhg-mr/lekcbl5mkrhgl线缆-中继mrmr --