单项选择题
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
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相关考题
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单项选择题
They（）loading at 1400 hours．
A.started
B.finished
C.completed
D.reported -
单项选择题
The net productivity per gang-hour can be improved through a decrease of（）.
A.Cranes/derricks
B.Crane/derrick cycles
C.Crane/derrick cycle time
D.Weight per package -
单项选择题
The Master or person in charge of a ship shall ensure the crane record book shows the（）.
A.Date and description of each failure
B.Average load in pounds for each usage
C.Total number of lifts for each usage
D.All of the above
