通信傳輸考試通信管道與通道工程設(shè)計規(guī)范單項選擇題每日一練(2019.01.19)

A.1m
B.3m
C.10m
D.15m

A.12
B.15
C.8
D.10

A.0.3，－0.3
B.0.3，0
C.0.4，0
D.0.4，－0.2

A.水泥管塊
B.聚氯乙烯塑料管
C.鋼管
D.硬質(zhì)或半硬質(zhì)聚乙烯塑料管

A.2
B.3
C.1
D.0.5