Distress flares and smoke signals for small passenger vessels（）.<br>A:are not required aboard vessels on runs of less than 30 minutes duration<br>B:must be Coast Guard approved and stowed in a portable，watertight container<br>C:must be marked with an expiration date not more than 42 months from the date of manufacture<br>D:All of the above

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

出自：海船船员证

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