单选题When viewed from above，the best position for the guy in relation to the boom is（）.AAt a 45° angleBAt right anglesC4 feet aft of the heel of the boomDParallel to the boom
单选题
When viewed from above，the best position for the guy in relation to the boom is（）.
A
At a 45° angle
B
At right angles
C
4 feet aft of the heel of the boom
D
Parallel to the boom
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