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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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更多 “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 hoistingB increases if the cargo runner is doubled upC decreases as the boom is topped to a greater angleD is determined by the thrust stresses on the boom” 相关考题
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UN identification numbersD
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考题
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考题
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yearB
two yearsC
four yearsD
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