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單項(xiàng)選擇題

The boom indicator on a crane will indicate the（）.

A.length of the boom
B.angle of the boom
C.lifting capacity of the boom
D.direction of the boom

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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

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

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