A.31N/m2 B.28.14N/m2 C.34.25N/m2 D.45.51N/m2
A.0.025 B.0.0335 C.0.0262 D.0.041
A.74.25cm油柱 B.74.25mH2O C.95.26cm油柱 D.62.26m油柱