【单选题】
Letter “G” shows that“ （）”.
A、I have a pilot on board
B、I require a pilot.
C、I have stopped.
D、My vessel is healthy .
查看正确答案
A、A.red triangle with the letter R B、B.white triangle with the letters RG C、C.green square with the letter G D、D.white square with the letter GR
