—I didn’t do well in this English examination. How about you？

　　 —I did ______ you.

A．not better than

B．no worse than

C．as well as

D．no better than

不是三K透平转速突然升高的原因是（）。

A、蒸汽带液

B、蒸汽压力突然升高

C、供油管破裂

D、供油管堵塞