stays
winches
barrels
brakes
第1题：
How many derricks are there at each hold?
第2题：
What does “evel-luffing” accomplish during crane operations ________．
A.It prevents the load from swinging when the boom level is adjusted
B.Less power is needed when topping the boom with a load on the hook
C.It maintains the height of the load above the deck
D.All of the above
第3题：
Ropes of wires attached to derricks to prevent them from swinging during cargo handling operations are ______.
A.Preventers
B.Side ropes
C.Stays
D.Guide lines
第4题：
（）are used to clean the bridge.
第5题：
很多船上在每个舱口处都有两个吊杆及两台起货机。（）
第6题：
Lower down and secure all derricks.
第7题：
For a floating vessel, the result of subtracting KG from KM is the ______.
A.height of the metacenter
B.height of the righting arm
C.height of the center of buoyancy
D.metacentric height
第8题：
Who usually adjust the derricks during the loading and discharging?
第9题：
我们每航次拆卸一次吊杆。（）
第10题：
数据结构与算法里，变量height要比原来少15，则应写成（）