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並前往https://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.493-15-201901-I!!PDF-E.pdf

Digital selective-calling system for use in the maritime mobile ...

Recommendation ITU-R M.493-15. (01/2019) ... During normal operation, the equipment should include an inactivity timer to return the DSC system.

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