单选题Topping wires fix the height of the derricks and （） to the deck may be used to prevent fore and aft movement.AstaysBwinchesCbarrelsDbrakes
单选题
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
参考解析
解析：
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相关考题：
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单选题我们每航次拆卸一次吊杆。（）AWe dismantle the jumbo boom twice a voyage.BWe dismantle the derricks once a voyage.CWe examine the derricks once a voyage.DWe dismantle the heavy derricks once a voyage.
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单选题What does “evel-luffing” accomplish during crane operations（）.AIt prevents the load from swinging when the boom level is adjustedBLess power is needed when topping the boom with a load on the hookCIt maintains the height of the load above the deckDAll of the above
单选题很多船上在每个舱口处都有两个吊杆及两台起货机。（）AMany ships have two derricks at each hatch.BMany ships have two winches at each hatch.CMany ships have two derricks and two winches at each hatch.DMany ships have two derricks and two winches at each hatch cover.