The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.<br>A:gear<br>B:nonpositive displacement<br>C:positive displacement<br>D:rotary

The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.
A:gear
B:nonpositive displacement
C:positive displacement
D:rotary

出自：海船船员证

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