A、centrifugal pump is cheaper than reciprocating pump
B、the size of centrifugal pump with same capacity is smaller than that of reciprocating pump
C、centrifugal pump makes maintenance easier than reciprocating pump does
D、all of the above
更多“On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）”相关的问题
A、There are several types of hatch covers on board ship. B、There are several types of hatches on board ship. C、There is one type of hatches on board ship. D、There is one type of hatch covers on board ship.
A、Sailors should know the SWL of cranes on board their ship. B、Sailors should know the SWL of derricks on board their ship. C、Officers should know the SWL of derricks on board their ship. D、Officers should know the SWL of cranes on board their ship.
A、Cleaning is a frequent job at sea. B、Painting is a frequent job on board a ship. C、Cleaning is a frequent job on board a ship. D、Repairing is a frequent job on board a ship.
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