高速离心泵运转时电机过负荷的原因有（）。

A、流体粘度高

B、电气故障

C、机械故障

D、泵出口流量大

—What did your teacher say this morning?

—She told us______.[ ]

A. why was Tom late for school again

B. whether we had too much homework

C. how she did come to school this morning

D. that we would have a test soon