This paper studied the application of fly ash on concrete sleeper with the method of ortho design.
本文采用正交设计的方法，对粉煤灰在高强预应力混凝土轨枕中的应用进行了试验研究。
In this paper, the synthetic method of high-ortho resol resin and influence of other chemicals ingredients on the adhesive was discussed.
讨论了高邻位酚醛树脂合成及其它助剂对减震胶性能的影响。
Methods To detect the sed occult blood of 200 specimens with both ortho-tolidine method and immunogold method. then analyse the results.
方法用邻联甲苯胺和便隐血胶体金检测试纸分别检测200例粪标本进行对照实验并分析。
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