The unit of duration of a dash in Morse Code is（）.
- Aone and one-half times the length of a dot
- Btwice the length of a dot
- Cthree times the length of a dot
- Dfour times the length of a dot
问题
The unit of duration of a dash in Mors
参考解析：
分类：海上通信基本知识题库
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