單項(xiàng)選擇題

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

在線練習(xí)

你可能感興趣的試題

單項(xiàng)選擇題

The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.

A.the pump cylinder
B.the pump cam
C.the pump plunger
D.the pump miler

單項(xiàng)選擇題

The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.

A.wheel
B.crankshaft
C.running gear
D.cam

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