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


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2.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

4.單項(xiàng)選擇題When my ship arrived there,their ship().

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