A.相對(duì)壓力=絕對(duì)壓力+大氣壓力B.絕對(duì)壓力=相對(duì)壓力-大氣壓力C.相對(duì)壓力=絕對(duì)壓力-大氣壓力D.大氣壓力=絕對(duì)壓力+相對(duì)壓力
A.壓力能B.壓力差C.通流截面面積D.管壁長(zhǎng)度
A.動(dòng);壓力B.壓力;動(dòng)C.機(jī)械;壓力D.壓力;機(jī)械