单项选择题
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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单项选择题
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 -
单项选择题
For any given pedestal crane，when the boom is lengthened，the lifting capacity is（）.
A.unchanged
B.increased
C.eliminated
D.decreased -
单项选择题
For a given weight of cargo，the stress on the heel block of a cargo boom（）.
A.increases as the cargo closes the head while hoisting
B.increases if the cargo runner is doubled up
C.decreases as the boom is topped to a greater angle
D.is determined by the thrust stresses on the boom
