You two follow me; the rest _____ where you are.
A.stays
B.lay
C.stay
D.stayed
答案:C
胸腔内压接近或略超过大气压,测定时可正可负,视气体量而定,抽气后压力不再复升的是()
A.单纯性气胸
B.开放性气胸
C.张力性气胸
D.少量气胸
E.大量气胸
何谓半保留复制?