單項選擇題The boom indicator tells the operator at what angle the boom is compared to the（）.
A.horizontal position of the boom
B.vertical position of the boom
C.horizontal position of the load being lifted
D.vertical position of the load being lifted
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1.單項選擇題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
2.單項選擇題Stop（）the derrick at once，the gooseneck is bent.
A.to use
B.to operate
C.maneuvering
D.using
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What is the purpose of the equalizing beam aboard a crane vessel（）.
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On no account（）to be exceeded.
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Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
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Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
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