單項選擇題

Stop（）the derrick at once，the gooseneck is bent.

A.to use
B.to operate
C.maneuvering
D.using

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單項選擇題

On no account（）to be exceeded.

A.is the S.W.L. of the crane
B.are the S.W.L. of the crane
C.the S.W.L. of the crane is
D.the S.W.L.of the crane are

單項選擇題

On a ship crane，the load chart relates the allowable load to the combination of boom length and（）.

A.boom angle
B.boom strength
C.load radius
D.cable strength