爆破后，开挖断面应进行检查（）
A、欠挖或超挖
B、周边炮眼保存率
C、两荐炮衔接处
D、开挖面是否平整
参考答案：A, B, C, D
---Do you know ______?
---Sorry, but if he _____ back, I ____ you know as soon as possible.
A．when will he be back, comes, will let
B．when he will be back, will come, will let
C．what time will he be back, will come, let
D．what time he will be back, comes, will let
保险代理行为的主体是（）。
A、保险人
B、保险代理人
C、投保人
D、被保险人
