例句與造句

1. In this paper , the so preparing self - compacting concrete with low and middle strength using super fine mountain sand artifical sand and phosphorus slag is studied systemically . through the study the influence of the shape , the proportion of the dust and the grade of sand to the workability and the mechanical property of self - compacting concrete , it is found that super fine mountain sand artifical sand are not suit to prepare low and middle strength self - compacting concrete , but when they are combined and the additive and assistant band material are used , c20 - c40 high performance self - compacting concrete is prepared ; the corresponding additive is developed to solve the delamination caused by the low proportion of banding material ; the evaluating system for the workability of low and middle strength self - compacting concrete is built ; the controlling method for production , construction and curing was set up . and the result of the research is applied into several projects
   通過分析特細山砂和機制砂的顆粒形態(tài)、粉末含量、顆粒級配等特性對自密實混凝土的工作性能和力學(xué)性能的影響，發(fā)現(xiàn)特細山砂、機制砂不宜單獨用于配制中低強度等級自密實混凝土，宜將特細山砂和機制砂進行合理復(fù)配，并選擇合適的外加劑和礦物摻合料，優(yōu)化配合比設(shè)計，可生產(chǎn)c20 c40中低強度等級自密實高性能混凝土；研制開發(fā)出了具有高效減水、保塑、抗離析功能的外加劑，有效解決了中低強度等級自密實混凝土由于膠凝材料用量少而出現(xiàn)的離析、泌水問題；應(yīng)用正交設(shè)計方法，對因素和水平進行合理選擇，確定了生產(chǎn)中低等級自密實混凝土的最優(yōu)配合比；建立了中低強度等級自密實混凝土的工作性評價體系；提出了生產(chǎn)、施工及養(yǎng)護的質(zhì)量控制技術(shù)方法。
2. It's difficult to find grading of sand in a sentence. 用grading of sand造句挺難的