—I'm sorry I'm late, because the traffic is bad.

—______, but tomorrow, please be on time. [ ]

A. It's a pleasure

B. Yon're welcome

C. It doesn't matter

D. That's right

提升机主电动机换向以及切除高压电源投入动力延时时，须在（）后进行。

A、急停

B、动力制动

C、电弧熄灭

D、接通低频电源