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
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 | ||||
2. The new summer camp will last for . | ||||
[ ] | ||||
A. half a month B. twenty-two days C. one month D. two months | ||||
3. If you want to take part in the new summer camp, you can call at _____. | ||||
[ ] | ||||
A. 56791830 B. 62187038 C. 62197830 D. 57917380 | ||||
4. The new summer camp mainly gives children a chance to enjoy _____. | ||||
[ ] | ||||
A. Chinese movies B. some paintings C. Chinese culture D. some sports | ||||
5. You can get more information about the new summer camp by _____. | ||||
[ ] | ||||
A. making a call B. sending an email C. visiting the website D. all the above |