The boom indicator tells the operator at what angle the boom is compared to the（）.<br>A:horizontal position of the boom<br>B:vertical position of the boom<br>C:horizontal position of the load being lifted<br>D:vertical position of the load being lifted

The boom indicator tells the operator at what angle the boom is compared to the（）.
A:horizontal position of the boom
B:vertical position of the boom
C:horizontal position of the load being lifted
D:vertical position of the load being lifted

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