A、draw the liquid in；force the liquid out
B、force the liquid out；draw the liquid in
C、suction；draw
D、deliver；outlet
更多“A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.”相关的问题
A、the position is suitable B、the position is reliable C、the position is changeable D、the position is fixable
A、A.dead-reckoning position B、B.fix B.estimated position C、C.probable position D、D.running fix
A、in position to starboard B、in position to port C、in position to anywhere D、in position fore and aft
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