A vessel is approaching from dead ahead.Both of her sidelights are visible and her range lights are in line.Which of the following could you do first（）.<br>A:Sound one blast of the whistle<br>B:Alter course to starboard<br>C:Construct a radar plot<br>D:Sound the danger signal

A vessel is approaching from dead ahead.Both of her sidelights are visible and her range lights are in line.Which of the following could you do first（）.
A:Sound one blast of the whistle
B:Alter course to starboard
C:Construct a radar plot
D:Sound the danger signal

出自：海船船员证

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