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
点击查看答案&解析
相关考题
-
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 -
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 -
单项选择题
The water level in the gauge glass when a boiler is operating is （） when the boiler is shut down.
A.lower than
B.higher than
C.below
D.equal to
