A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.
- Adraw the liquid in；force the liquid out
- Bforce the liquid out；draw the liquid in
- Csuction；draw
- Ddeliver；outlet
问题
A positive displacement pump is that w
参考解析：
分类：船舶辅助机械题库
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