单选题For a given weight of cargo，the stress on the heel block of a cargo boom（）.Aincreases as the cargo closes the head while hoistingBincreases if the cargo runner is doubled upCdecreases as the boom is topped to a greater angleDis determined by the thrust stresses on the boom
单选题
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
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