单项选择题

A.0.20~0.29kPa(2~3cmH2O)
B.0.29~0.39kPa(3~4cmH2O)
C.0.39~0.49kPa(4~5cmH2O)
D.0.49~1.18kPa(5~12cmH2O)
E.1.18~1.47kPa(12~15cmH2O)