平成29年度 地熱井掘削監督者養成講座 掘削技術概論

平成29年度 地熱井掘削監督者養成講座 掘削技術概論

72 Pages · 2017 · 8.35 MB · Japanese
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“ No amount of guilt can solve the past, and no amount of anxiety can change the future. ” ― Anonymous
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