单项选择题

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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单项选择题

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

单项选择题

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

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