水道工事標準仕様書 平成 31 年 4 月版 主な改定点

水道工事標準仕様書 平成 31 年 4 月版 主な改定点

205 Pages · 2017 · 2.39 MB · Japanese
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“ Courage doesn't always roar. Sometimes courage is the quiet voice at the end of the day saying, "I will try again tomorrow." ” ― Mary Anne Radmacher
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