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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1.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
2.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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Running an electric winch at slow speed over a long period of time causes（）.
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