You may BEST turn a twin-screw vessel about to the right in a narrow channel by using ____

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You may BEST turn a twin-screw vessel about,to the right,in a narrow channel by using ______.

A.Both engines ahead and helm

B.One engine only

C.Port engine ahead and the starboard engine astern

D.Both engines astern and use helm

请帮忙给出正确答案和分析,谢谢!

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