NFPA72-2002中有一句话，麻烦各位高人帮忙翻译下：A code alarm signal shall consist of not less than three complete rounds of the number transmitted.Each round shall consist of not less than three impulses.小弟先行谢过！:)
A code alarm signal shall consist of not less than three complete rounds of the number transmitted.
Each round shall consist of not less than three impulses.
小弟先行谢过！:)
