A . A.0.49~0.98kPa(5~10cmH2O)B . B.0.98~1.47kPa(10~15cmH2O)C . C.1.47~1.96kPa(15~20cmH2O)D . D.2.45~2.94kPa(25~30cmH2O)E . E.2.94~3.43kPa(30~35cmH2O)
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