A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.<br>A:draw the liquid in；force the liquid out<br>B:force the liquid out；draw the liquid in<br>C:suction；draw<br>D:deliver；outlet

A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.
A:draw the liquid in；force the liquid out
B:force the liquid out；draw the liquid in
C:suction；draw
D:deliver；outlet

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