單項(xiàng)選擇題AMVER is a system which provides（）.

A.satellite communications
B.navigational information
C.weather information
D.position reporting service


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1.單項(xiàng)選擇題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

2.單項(xiàng)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

3.單項(xiàng)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

5.單項(xiàng)選擇題“How do you read?” “I read you with signal strength one”（）.

A.poor
B.bad
C.fair
D.good