底层铺垫、夯实? (C---E)Placing of the Trench Bed; 指对开挖好的管槽在管段吊入前的底层铺垫、夯实等前期工作。 Placing of the Trench Bed;means the preliminary work (such as bedding and ramming)to be done before lifting the pipes into the trench. 请多多挑刺!(Sorry原文就是中英文混杂的,中译英未译完) 查看更多2个回答 . 1人已关注