單項(xiàng)選擇題

What is/are the advantage（s）of cranes over conventional cargo booms（）.

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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單項(xiàng)選擇題

What is the purpose of the equalizing beam aboard a crane vessel（）.

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

單項(xiàng)選擇題

What is meant by the term“l(fā)uffing the boom”of a crane（）．

A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above

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What is/are the advantage（s）of cranes over conventional cargo booms（）.

你可能感興趣的試題

What is the purpose of the equalizing beam aboard a crane vessel（）.

What is meant by the term“l(fā)uffing the boom”of a crane（）．