A.50~150mmH2OB.60~160mmH2OC.70~170mmH2OD.80~180mmH2OE.90~190mmH2O
A.出發(fā)點(diǎn)B.維持點(diǎn)C.立足點(diǎn)D.基礎(chǔ)點(diǎn)