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单选题
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
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单选题Certain requirements must currently be met by a ship’s steering system.There must be （）independent means of steering, although where two identical power units are provided, an auxiliary unit is not required.A
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单选题Which statement correctly applies to a situation where a sailing vessel is overtaking a power-driven vessel（）.A
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单选题A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and （）.A
one sidelight and the masthead light are visibleB
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both vessels sound one prolonged blastD
both sidelights and masthead light(s) are visible
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