单项选择题
A.satellite communications B.navigational information C.weather information D.position reporting service
A yellow signal，floating in the air from a parachute，ab...
单项选择题A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.
A.will be coming to periscope depth B.will be coming to the surface C.is on the bottom in distress D.is in distress and will try to surface
A rigid replica of the International Code flag A may be...
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
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
