离心泵在工作时，其油温不能超过（）。
A.55℃
B.70℃
C.80℃
D.90℃
参考答案：B
词汇
Good， die， question， information， success
小题1:The answers to the __________ are not right.
小题2:He is a _________ athlete. Most people know him.
小题3:Who is __________ in Physics in your class?
小题4:Sam is looking for some __________ about the earthquake.
小题5:Her __________ shocked us a lot.
