安装于钻井液泵缸套内的泵冲传感器之所以要经常检查,主要是为了避免()。
A、错位
B、受碰撞
C、水侵
D、信号线断
参考答案:B
根据句意和所给汉语提示完成单词。
1. I have never seen such a big _____(娱乐)park.
2. You have not been to a water park, _____(也不)have I.
3. The park has many different kinds of _____(老式的)trains.
4. Everyone in our class is interested in _____(欧洲的)culture.
5. It _____(花费)my mother about half an hour to walk to a wonderful zoo
yesterday.
6. We all like to travel to many countries, _____(尤其)Peru.
【真题试题】 (2009年单项选择第33题)我国的生育保险基金来源于( )缴纳的生育保险费。
A.城镇企业
B.基层政府
C.职工个人
D.职工家属