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單項選擇題

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

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單項選擇題

A message by flashing light consists of the call，the text，the ending，and the（）.

A.identity
B.time of origin
C.reply
D.procedure code

單項選擇題

A message by flashing light consists of the call，the identity，the ending，and the（）.

A.reply
B.text
C.time
D.answer

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