A.位移平衡原理 B.力矩平衡原理 C.力平衡原理 D.功率平衡原理
A.-600mmH2O B.-800mmH2O C.0mmH2O D.800mmH2O
A.600mm水柱,0.1Mpa B.0,0.1MPa C.0,0.02Mpa D.600mm水柱,0.02Mpa