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.
- Aobscured
- Bdarkened
- Cgreyed
- Ddelighted
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1、By night，you sight the lights of a ves
By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.Aa floodlightBtwo red lights in a vertical lineCa single red lightDany visible light
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2、Damage to cargo caused by dust is know
Damage to cargo caused by dust is known as（）.AcontaminationBoxidationCtaintingDvaporizatio
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3、Full details of all lights and fog sig
Full details of all lights and fog signals are shown on（）.Alarge scale chartBsmall scale chartCocean chartDrouting chart
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4、The fog produced by warm moist air pas
The fog produced by warm moist air passing over a cold surface is called（）.Aconduction fogBradiation fogCfrontal fogDadvection fog
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5、Advection fog may be formed by cold ai
Advection fog may be formed by cold air passing over a（）.Acolder sea surfaceBwarmer sea surfaceCdry coastal plainsDhigh mountain or plateau
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6、You are underway in thick fog. You hav
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.AYour speed must be reduced t...