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Proppant plays a critical role in the exploitation of oil and gas,especially in the development of nonconventional oil a......
目的：探讨部分齿线区切除在超低位直肠癌根洽保肛术中的应用效果。方法：2001至2003年对11例肿瘤下缘距齿线〈3cm的超低位直肠癌，采用......
为落实国家节能减排的要求,通过对现有燃煤锅炉烟气处理设施的运行优化和超低排放改造,采用低氮燃烧+SCR脱硝、氨法脱硫、布袋除尘......
The Heck coupling reactions of aryl halides and olefins were performed under the microwave assistance. Interestingly, th......
