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
点击查看答案&解析
相关考题
-
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 -
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
