长途电缆气压下降允许范围每10天()KPa
A.5
B.10
C.15
D.20
参考答案:B
会车前选择的交会位置不理想时,应怎样做?
A、加速选择理想位置B、减速、低速会车或停车让行C、向左占道,让对方减速让行D、打开前照灯,示意对方停车让行
— _________ windows can you see ? —I can see five.[ ]
A. How much
B. How many
C. What