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

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

出自：海船船员证

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