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單項選擇題

How is “radio silence” imposed?（）

A.By the On Scene Coordinator (OSC)
B.By the Coast Earth Station (CES) controlling the distress communications on that frequency
C.It is imposed by the Public Correspondence Station (PCS) controlling the distress communications on that frequency or channel
D.It is imposed by the High Seas Service (HSS) controlling the distress communications on that frequency or channel

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單項選擇題

Distress signals may be（）.

A.red flares
B.smoke signals
C.sound signals
D.Any of the above

單項選擇題

Distress flares and smoke signals for small passenger vessels（）.

A.are not required aboard vessels on runs of less than 30 minutes duration
B.must be Coast Guard approved and stowed in a portable，watertight container
C.must be marked with an expiration date not more than 42 months from the date of manufacture
D.All of the above

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How is “radio silence” imposed?（）

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Distress signals may be（）.

Distress flares and smoke signals for small passenger vessels（）.