（）is the most visible signal of distress from a lifeboat at sea in the daytime.<br>A:Smoke signal<br>B:Flash signal<br>C:Fire signal<br>D:Radio emergency transmission

（）is the most visible signal of distress from a lifeboat at sea in the daytime.
A:Smoke signal
B:Flash signal
C:Fire signal
D:Radio emergency transmission

出自：海船船员证

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