What is meant by the term“luffing the boom”of a crane（）．<br>A:Stopping the boom<br>B:Topping or lowering the boom<br>C:Moving the boom left or right<br>D:All of the above

What is meant by the term“luffing the boom”of a crane（）．
A:Stopping the boom
B:Topping or lowering the boom
C:Moving the boom left or right
D:All of the above

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