They were so late that they ____had time to catch the train.

A．almost

B．hardly

C．nearly

D．simply

当发电机进相运行时，有功表和无功表分别显示（）。

A.＋P，＋Q；

B.－P，－Q；

C.＋P，－Q；

D.－P，＋Q。