问题
单项选择题
石油在流动时，其内部分子间产生的摩擦阻力称为原油（）。
A、粘度
B、阻力
C、毛细管力
D、表面张力
答案
参考答案：D
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石油在流动时，其内部分子间产生的摩擦阻力称为原油（）。
A、粘度
B、阻力
C、毛细管力
D、表面张力
参考答案：D
| 阅读下面表格内容，从每题所给的A、B、C3个选项中，选出1个最佳答案。 | ||||||||||||||||||
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| 1. How many main problems are there in the survey? | ||||||||||||||||||
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| A. Four. B. Five. C. Six. | ||||||||||||||||||
| 2. What problems are caused by too much homework? | ||||||||||||||||||
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| A. Get fat. B. Fight with each other. C. Feel stressed and get short sighted. | ||||||||||||||||||
| 3.If Simon is feeling stressed, he should . | ||||||||||||||||||
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| A. do much more homework B. buy some snacks C. make a plan for study and hobbies | ||||||||||||||||||
| 4. Peter doesn't like study. Maybe he . | ||||||||||||||||||
[ ] | ||||||||||||||||||
| A. plays too many computer games B. has no pocket money C. gets fatter and fatter | ||||||||||||||||||
| 5. is a good way for students to stop fights. | ||||||||||||||||||
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| A. Doing less homework B. Learning how to make friends C. Playing computer games |