能营养全身,化生血液的是()
A.元气
B.宗气
C.营气
D.卫气
E.中气
参考答案:C
- Would you like to join us in the game?
- _____, for I have some homework to do. [ ]
A. I will
B. I'd love to
C. I won't
D. I'm afraid not
液压传动中,油缸属于()元件。
A.驱动
B.执行
C.控制
D.辅助