單項(xiàng)選擇題
A.0 B.6 C.12 D.18
A.4000mm B.4800mm C.4400mm D.4600mm
A.4000mm B.4200mm C.4400mm D.4600mm
A.4000mm B.4200mm C.4400mm D.5000mm
A.任何情況下均不可 B.緊急情況下可以 C.在單線的時(shí)候 D.在沒有車輛通行時(shí)
A.一短聲 B.兩長(zhǎng)聲 C.兩短聲 D.一長(zhǎng)聲
A.5m B.3.5m C.4m D.6m
A.15 B.20 C.5 D.30
A.5 B.4 C.2 D.3