单选题The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.AgearBnonpositive displacementCpositive displacementDrotary
单选题
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
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