Natural light or “white” light isactually made up of many colors.

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• A vessel showing a yellow light over a white light at night is a vessel（）.

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• Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.

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• When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.

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