单项选择题

A towing light is a yellow light having the same characteristics as a(n)（）

A.special flashing light
B.anchor light
C.sternlight
D.masthead light

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单项选择题

A single towing light will be carried above a vessel’s sternlight（）.

A.only if she is towing astern
B.only if the tow exceeds 200 meters
C.at any time when towing
D.if the towing vessel is part of a composite unit

单项选择题

A safe water daymark has what shape? （）

A.Triangular
B.Diamond
C.Circular
D.Octagonal

单项选择题

A red triangular daymark marks（）.

A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.area of a channel where passing another vessel is permitted