问题
单项选择题
超音速一元等熵气流在渐缩管道中随截面积减小，密度ρ（）。
A.减小
B.增大
C.不变
D.不确定
答案
参考答案：B
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超音速一元等熵气流在渐缩管道中随截面积减小，密度ρ（）。
A.减小
B.增大
C.不变
D.不确定
参考答案：B
| 阅读理解。 |
Food, Drink & Refreshment |
| 1. The above reading is most probably ______. |
[ ] |
| A. an advertisement B. a food report C. a shopping list D. a menu |
| 2. It's clear that the Eatery ______. |
[ ] |
| A. can hold 150 people at most B. only provides Chinese food C. was set up in the year of 1980 D. doesn't offer many choices |
| 3. At the loch Ness Eatery, visitors can ______. |
[ ] |
| A. book comfortable room B. have a picnic C. cook for themselves D. get a good relaxation |
| 4. The reading also tells us ______. |
[ ] |
| A. the prices of food and drinks B. the address of the Eatery C. the name of the manager D. the way of getting in touch with the Eatery |
| 5. The Eatery provides almost everything to ______. |
[ ] |
| A. to serve people for a long time B. meet the needs of different visitors C. let people take away D. help people learn about people |