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 athwartshi
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 athwartshi
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