单项选择题

The Rules state that a seaplane shall（）.

A.not be regarded as a vessel
B.in general，keep well clear of all vessels
C.proceed at a slower speed than surrounding vessels
D.when making way，show the lights for a vessel not under command

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单项选择题

The rules require which factor to be taken into account when determining safe speed（）.

A.The construction of the vessel
B.The experience of the vessel's crew
C.The location of vessels detected by radar
D.All of the above

单项选择题

The Navigation Rules state that a vessel shall be operated at a safe speed at all times so that she can be stopped within（）.

A.The distance of visibility
B.1/2 the distance of visibility
C.A distance appropriate to the existing circumstances and conditions
D.The distance that it would require for the propeller to go from full ahead to full astern