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單項(xiàng)選擇題

A triangular daymark would be colored（）.

A.red
B.red and white
C.green
D.green and white

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單項(xiàng)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

單項(xiàng)選擇題

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

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