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

单项选择题LAND-BASED AUTHORITY CONDUCTING AND CO-ORDINATING SEARCH AND RESCUE OPERATIONS IN A DESIGNATED AREA defines（）.

A.RCC
B.OSC
C.CSS
D.GPS

单项选择题When my ship arrived there，their ship（）.

A.has left already
B.left already
C.had left already
D.would left already