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
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相关考题
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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 -
单项选择题
The item（）is not the advantage of the hydraulic winch．
A.less jerky starts
B.less jerky stops
C.overheating worries
D.none of the overheating worries -
单项选择题
Sudden starts or stops of the boom is likely to cause all of the following except（）.
A.breaking a cargo runner
B.parting guys topping lifts
C.carrying away a block
D.overheating the resistors and eventually burning out
