问题
单项选择题
叶片泵是依靠（）的旋转运动，把机械能传给液体，使液体能量增加而输送液体的。
A、齿轮
B、叶轮
C、蜗轮
D、联轴器
答案
参考答案：B
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叶片泵是依靠（）的旋转运动，把机械能传给液体，使液体能量增加而输送液体的。
A、齿轮
B、叶轮
C、蜗轮
D、联轴器
参考答案：B
| 阅读理解。 | ||||
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| 1. Hua Mandarin is the name of a _____. | ||||
[ ] | ||||
| A. person B. school C. Chinese course D. summer camp | ||||
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[ ] | ||||
| A. half a month B. twenty-two days C. one month D. two months | ||||
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| A. 56791830 B. 62187038 C. 62197830 D. 57917380 | ||||
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| A. Chinese movies B. some paintings C. Chinese culture D. some sports | ||||
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[ ] | ||||
| A. making a call B. sending an email C. visiting the website D. all the above |