You can indicate that your vessel is in distress by（）.
- Adisplaying a large red flag
- Bdisplaying three black balls in a vertical line
- Csounding four or more short rapid blasts on the whistle
- Dcontinuously sounding the fog whistle
问题
You can indicate that your vessel is i
参考解析：
分类：遇险通信题库
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