單項選擇題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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1.單項選擇題Oil product samples should be taken from the（）.
A.dock riser
B.ship's cargo tanks
C.shore tank discharge
D.All of the above
2.單項選擇題For any given pedestal crane，when the boom is lengthened，the lifting capacity is（）.
A.unchanged
B.increased
C.eliminated
D.decreased
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