A rigid replica of the International Code flag “A” may be shown by a vessel （）.<br>A:pulling a submarine cable<br>B:engaged in diving operations<br>C:engaged in underway replenishment<br>D:transferring explosives

A rigid replica of the International Code flag “A” may be shown by a vessel （）.
A:pulling a submarine cable
B:engaged in diving operations
C:engaged in underway replenishment
D:transferring explosives

出自：海船船员证

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