The process of lowering a boom to a horizontal position and onto its deck support is called（）.<br>A:spotting a boom<br>B:collaring a boom<br>C:cradling a boom<br>D:toppling a boom

The process of lowering a boom to a horizontal position and onto its deck support is called（）.
A:spotting a boom
B:collaring a boom
C:cradling a boom
D:toppling a boom

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