解1:取储气罐为系统(开口) S0=dE +SN CV net +(+c2+g)6m (h+ 2+gz)omin dEc+amout=o 2 on out amout h≈0解1:取储气罐为系统（开口） h≈0 ( ) V ( ) cv net 2 out out 2 in in d / 2 / 2 Q E W h c gz m h c gz m     = + + + + − + + dE h m cv out + =  0 U U h m 2 1 out − = −   U U h m 1 2 out − =  