The hills are largely carboniferous limestone, which is quarried at several sites.从多处遗址的挖掘来看, 这片丘陵大部分属石炭纪石灰岩.In Early Carboniferous, Tianshan mountains entered an intraplate evolution stage.从石炭纪开始天山地区进入陆内演化阶段.WHERE HAINA...
The foregoing considerations may be concluded in a few words.上述各种考虑可以用几句话来归纳一下.We feel that the foregoing analysis is deceptive and dangerous.我们认为上述的分析是靠不住的,也是危险的.The foregoing paragraphs were written in 1985.前面的几个段落写于19...
在脱氨作用中, 分子 含氨基 的部分被移去.In deamination, the nitrogen - containing amino portion of the molecules is removed.叠氮还原是向有机分子中引入氨基的重要方法.Reduction of azides is an important method to introduce amino group to organic molecules.采购产品...