单项选择题

A.肺不张病人PaO2↓肺切除病人PaO2
B.肺不张病人V/Q=0.8肺切除病人VQ<0.8
C.肺不张病人PaO2↓V/Q>0.8肺切除病人PaO2正常V/Q>0.8
D.肺不张病人PaO2↓V/Q<0.8肺切除病人PaO2正常V/Q正常
E.肺不张病人PaO2正常V/Q正常肺切除病人PaO2↓V/Q>0.8