单选题0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.Avertical positionBhorizontal positionCboom stop angleDminimum radius angle
单选题
0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.
A
vertical position
B
horizontal position
C
boom stop angle
D
minimum radius angle
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