问题
单项选择题
钻井泵的喷淋空和喷淋盒嘴每（）检查一次。
A.8h
B.12h
C.24h
D.168h
答案
参考答案：C
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钻井泵的喷淋空和喷淋盒嘴每（）检查一次。
A.8h
B.12h
C.24h
D.168h
参考答案：C
| 阅读理解。 | |||||||||||||||
Survey about What Students Do in the Summer Vacation
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| 1. Most students _____ in the summer vacation. | |||||||||||||||
| A. learn some subjects B. play computer games C. do chores at home | |||||||||||||||
| 2. According to the survey, what the students like to do best is _____. | |||||||||||||||
| A. Study in the training school B. get together with their classmates C. do chores at home |