It is the responsibility of the crane operator to, at all times, be aware of the location of the __.
A.load
B.hook
C.boom
D.All of the above
正确答案：D
吊车驾驶员的责任是在任何时候都要了解到货物吊钩吊杆的位置
Itistheresponsibilityofthecraneoperatortoatallti
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