What is meant by the term TOPPING THE BOOM?（）<br>A:Lowering the boom<br>B:Raising the boom<br>C:Spotting the boom over the deck<br>D:Swinging the boom athwartships

What is meant by the term TOPPING THE BOOM?（）
A:Lowering the boom
B:Raising the boom
C:Spotting the boom over the deck
D:Swinging the boom athwartships

出自：海船船员证

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