随着植被覆盖面的消失，每次雨季都将更多的宝贵的表土层冲到湖里去。
With the tree cover gone, every rainy season sees more of the precious topsoil washed away into the lake.
针对深厚表土层中冻结钻孔存在的钻孔深、偏斜率难控制等施工存在的问题，提出了一些施工与管理的经验。
It is difficult to control the hole and the slope during frozen drill in profundity surface soil, this text bring forward some experience of management and construction.
应用推荐