The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.<br>A:vertical motion of white flags<br>B:vertical motion of a white light or flare<br>C:firing of a green star signal<br>D:None of the above

The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.
A:vertical motion of white flags
B:vertical motion of a white light or flare
C:firing of a green star signal
D:None of the above

出自：海船船员证

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