單項選擇題

A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）

A.One
B.Two
C.Three
D.Four

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單項選擇題

A towing light，according to the Rules，is a（）.

A.white light
B.red light
C.yellow light
D.blue light

單項選擇題

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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