On a working copy of a weather map，a cold front is represented by what color line? （）<br>A:Red<br>B:Blue<br>C:Alternating red and blue<br>D:Purple

On a working copy of a weather map，a cold front is represented by what color line? （）
A:Red
B:Blue
C:Alternating red and blue
D:Purple

出自：海船船员证

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