The second stage foundation pit of the TGP will be bounded by the upstream and downstream transverse cofferdams and the longitudinal concrete cofferdam.
三峡工程二期上下游横向围堰与混凝土纵向围堰共同形成基坑，保证二期工程施工。
It has proved by the experiment that the non - removal mesh form can replace the manual roughing on concrete surface in the first and second stage concrete construction.
试验证明，免拆模板网用在一、二期混凝土中可以代替人工凿毛工艺。
The second part: concrete analysis on education contradictions of supply and demand on this stage of our country.
第二部分：现阶段我国教育供求矛盾的具体表现。
For the lining of the main body (2) of the dust chamber (1) and first and second stage cyclones (3, 4) are used the non-porous and wear proof material, for example concrete.
集尘室(1)的主体(2)以及第一和第二级旋风器(3,4)的内衬使用无孔耐磨材料，例如混凝土。
For the lining of the main body (2) of the dust chamber (1) and first and second stage cyclones (3, 4) are used the non-porous and wear proof material, for example concrete.
集尘室(1)的主体(2)以及第一和第二级旋风器(3,4)的内衬使用无孔耐磨材料，例如混凝土。
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