单项选择题
A.windlass B.anchor capstan C.turning gear D.winch barrel
（） may be fitted for operating the derrick topping lift...
单项选择题（） 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
（） provides the head or pressure to supply the domestic...
单项选择题（） 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
Under rotary pumps are the gear, （）, cam-and-piston and...
单项选择题Under rotary pumps are the gear, （）, cam-and-piston and screw types.
A.reciprocating B.diffuser C.turbine D.vane
