油泵过度发热的原因是什么？
参考答案：
油泵过度发热的原因是：油泵磨损或损坏；冷却不足或冷却中断；油的粘度过低。
We were just about ready to leave _____ it started to snow.
A．when
B．before
C．after
D．since
肝性脑病者呼吸有（）。
A.酒味
B.肝臭味
C.烂苹果味
D.大蒜味
E.氨味
