题目内容
The basic difference between domestic and foreign market research is: ____?
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In many Asian cities, there are no street maps, some streets are not identified, and some houses are not numbered making it difficult for market researchers attempting to conduct an accurate __________. ____?
变质岩的结构按成因分为( )
一种玄武岩基质的结构特点是长条形斜长石微晶不规则排列,其间隙中充填物为辉石、磁铁矿细小颗粒和部分玻璃质,此结构名称是( )
衡量岩浆岩碱性程度的常用化学指数(σ)称为(里德曼)指数,其计算公式为σ=[w(K2O+ Na2O)2]/[w(SiO2)-43]。如果一块岩石的w(SiO2)=51%,w(CaO)=5.0%,w(K2O)=4.0%,w(Na2O)=4.0%,那么其σ=______ ,属于______ 系列。
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