... 监测音频单音 supervisory audio tone SAT 监护信号 Guarding signal 监控板 Monitor board MON ...
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Inside and outside cable and circuit laying out, guarding, connection, switch-in, leading out and conductor arrangement of internal signal room on construction site.
工程地点内信号室内外电缆及电线路的敷设、防护、接续、引入、引出、配线等。
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