造成翼面上下面速度变化的原因有两个:一是();二是()。
参考答案:机翼或平尾有迎角;翼型的不对称
用所给动词的适当形式填空。
1. Would you please _____ (not open) the door? It's so cold.
2. She didn't get better grades because of _____ (play) games too much.
3. Linda will be very sad if she _____ (not see) you.
4. The teacher often makes Jack _____ (stand) in class.
5. There _____ (be) an English party tonight, is there?
6. As we all know, light _____ (travel) faster than sound.
7. He hopes he _____ (win) the first prize again in the match.
8. Wang Hao spends as much as he can _____ (practice)table tennis every day.
9. It rained heavily yesterday, so my father _____ (drive) me to school.
10. Quiet! The students _____ (have) an English class.
下列属于非凹陷性水肿的是()。
A.肝源性水肿
B.肾源性水肿
C.心源性水肿
D.营养不良性水肿
E.黏液性水肿