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この投稿は最後にhesonchang214によって2016-5-11 11:20に編集されました。参加報酬：2財富。正解の報酬：9富。 ( )通常は、地面に排水溝や運水溝を設けたり、土塁を築いたりするなどの措置が講じられる。 A. 集水井による降水 B. 井点降水 C. 軽量井点 D. 地面排水 正解：A
D. 地面排水~~~~~~~
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