单项选择题
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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单项选择题
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 -
单项选择题
A message by flashing light consists of the call，the identity，the ending，and the（）.
A.reply
B.text
C.time
D.answer -
单项选择题
“How do you read?” “I read you with signal strength one”（）.
A.poor
B.bad
C.fair
D.good
