--- I’m going on a trip to Beijing soon.　    ---_______.

A．That’s all right.

B．Sorry to hear that

C．Be careful. Don’t be too happy.

D．Have a good trip.

110V及以上送变电工程试运行完成后（）内，系统调试单位应提供试运行报告。

A.15天

B.30天

C.45天

D.60天