單項(xiàng)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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1.單項(xiàng)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
2.單項(xiàng)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
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