A.Cranes are able to pick up and drop loads over a greater spotting area
B.Increased safety because the deck is clear of running and standing rigging
C.Simplicity of operation of the crane by its operator
D.All of the above
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A.It allows for rotation of the hook in the single mode
B.It is required to“twin-up”30-ton pedestal cranes
C.It is used to pick up light loads
D.It is used to rigidly connect two cranes
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
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
A.started
B.finished
C.completed
D.reported
A.Cranes/derricks
B.Crane/derrick cycles
C.Crane/derrick cycle time
D.Weight per package
最新試題
Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.
How should you signal the crane operator to lower the boom and raise the load（）.
What is meant by the term“l(fā)uffing the boom”of a crane（）．
Official draft measurements should be（）by authorized persons，agreed by both parties involved.
Sudden starts or stops of the boom is likely to cause all of the following except（）.
What is the purpose of the equalizing beam aboard a crane vessel（）.
The Master or person in charge of a ship shall ensure the crane record book shows the（）.
Which statement comparing a shipboard crane to conventional gear is TRUE（）.
Pedestal cranes have limit switches to restrict movement of which function（s）（）.
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.