During a training exercise a submarine indicating that a torpedo has been fired will send up smoke from a float. The smoke’s color will be（）.<br>A:black<br>B:red<br>C:orange<br>D:yellow

During a training exercise a submarine indicating that a torpedo has been fired will send up smoke from a float. The smoke’s color will be（）.
A:black
B:red
C:orange
D:yellow

出自：海船船员证

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