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