肺通气的直接动力是()。
A.肺内压与胸内压之差
B.胸内压与跨壁压之差
C.大气压与肺内压之差
D.大气压与胸内压之差
E.大气压与跨壁压之差
参考答案:C
具有止痛作用,可用于风湿痹痛的药物有()。
A.防风
B.羌活
C.藁本
D.细辛
E.白芷
These are all good team sports and will help you ______ your strength and you will meet lots of people at
the same time. [ ]
A. grow up
B. give up
C. mix up
D. build up