单项选择题
A.pulling a submarine cable B.engaged in diving operations C.engaged in underway replenishment D.transferring explosives
A message by flashing light consists of the call，the te...
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
A message by flashing light consists of the call，the id...
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
“How do you read?” “I read you with signal strength one...
单项选择题“How do you read?” “I read you with signal strength one”（）.
A.poor B.bad C.fair D.good
