液压A系统刹车液压保险共有（）个。
A.1
B.2
C.3
D.4
参考答案：B
—I don’t know ______. Can you tell me? —Yes, at 3 tomorrow afternoon.
A．when we had a meeting
B．when did we have a meeting
C．when we will have a meeting
D．when will we have a meeting
建设工程的建设过程大体经过（）
A.勘查
B.设计
C.施工
D.验收
