A.1m B.3m C.5m
A.架空 B.深埋 C.接地
A.機(jī)長(zhǎng) B.架子隊(duì)長(zhǎng) C.共班長(zhǎng)
A.不得 B.經(jīng)過同意后可以 C.允許
A.20t B.12t C.16t