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時間
Directory > World > Chinese_Traditional > 參考 > 時間
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| World > Chinese_Traditional > 科學 > 天文學 > 曆法與計時 (3) |
  負責建立時間與頻率國家標準，建立全國性時頻追溯體系，同步服務技術，提供精密儀器頻率校正服務。 |
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