泥浆泵需要大修的情况是()。
A.活塞缸套磨损,压力下降
B.泥浆泵有严重异响
C.泥浆泵各部件严重磨损
D.以上均不需大修
参考答案:B, C
The tall building _______ we have lessons _________ in 2002.[ ]
A. where, found
B. in where, founded
C. in which, was founded
谈判方案的依据和原则是什么?