單項(xiàng)選擇題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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1.單項(xiàng)選擇題They（）loading at 1400 hours．

A.started
B.finished
C.completed
D.reported

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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