单项选择题
A.The winch motor B.The band brake C.The winch barrel D.The anchor capstan
（） unit is mounted so as to raise and lower the cable f...
单项选择题（） unit is mounted so as to raise and lower the cable from the spurling pipe, which is at the top and center of the chain or cable locker.
A.The cable lifter B.The hoisting motor C.The topping wire D.The life-raft
Topping wires fix the height of the derricks and （） to ...
单项选择题Topping wires fix the height of the derricks and （） to the deck may be used to prevent fore and aft movement.
A.stays B.winches C.barrels D.brakes
Large pipes or down-comers are fitted between the steam...
单项选择题Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.
A.fire-tubes B.furnaces C.water drums D.water wall tubes
