单项选择题

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

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

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单项选择题
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
单项选择题
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
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