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單項(xiàng)選擇題

（） may be fitted for operating the derrick topping lift (the wire which adjusts the derrick height).

A.A capstan
B.A hold
C.A warp end
D.A mooring drum

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單項(xiàng)選擇題

（） provides the head or pressure to supply the domestic water where required.

A.The compressed air
B.The compressing air
C.The transfer pump
D.The head tank

單項(xiàng)選擇題

Under rotary pumps are the gear, （）, cam-and-piston and screw types.

A.reciprocating
B.diffuser
C.turbine
D.vane

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