The metallogenesis is close related with the Caledonian - Indosinian regional metamorphism.加里东期~印支期区域变质作用与成矿密切相关.THE METALLOGENESIS AND MAGMATIC DIFFERENTIATION OF SUZHOU A - TYPE GRANITE.金和有关元素的构造化学分异.The alteration and...
农民用脱粒机脱粒.Farmers thresh grain with threshing machines.他和他的堂兄弟们合伙买了一台蒸气脱粒机.He and his cousins bought a steam thresher on shares.脱粒机现在由电驱动.Now electricity runs the thresher....
以苯胺和溴乙烷为原料,用四乙基氢氧化铵作相转移催化剂,在常压下合成N, N二乙基苯胺.N, N - diethylaniline was synthesized under normal tempreture with tetraethyl ammonium hydroxide as phase transfer catalyst.利用β-环糊精-1,2-二溴乙烷乙醇混合体系作增敏剂首次提出了用荧光光度法测量阿苯达唑含量的方法.A fl...