发布时间:2025-01-31 05:08:35
直埋式式相对于管沟式而言,即直接开挖沟槽后排管,然后回填;管沟式为先修建一条排水沟形式的沟,然后加盖板。
刚抽上来的水是清澈的放置23小时水面就浮着一层白色物体白色的是什么能喝吗
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