According to Regulations a power driven auxiliary steering gear for a vessel capable of a

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According to Regulations, a power driven auxiliary steering gear for a vessel capable of a 12 knot service speed, must be able to meet the rudder movement requirements at which of the minimum vessel speeds listed below?

A.6 knots

B.7 knots

C.9 knots

D.12 knots

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗