Most direct substitution of groups bound to an aromatic nucleus is limited to diazonium salts.大多数连于芳核能被直接取代的基团仅限于重氮盐.Severe steric effects at the reactive carbon would impede the substitution.大的立体效应阻止在碳上的取代.We use saccha...
Modern pizza is attributed to baker Raffaele Esposito of Naples in the Italian region of Campania.现代比萨饼是意大利坎帕尼亚归因于面包地区拉法莱埃斯波西托在那不勒斯.He died at Campania in March of 12 BC at the age of 51.前12年三月阿格里帕卒于坎帕尼亚,年五十一....the moun...
在斯堪的纳维亚神话里，月亮被赋予了男性身份。In Norse mythology the moon is personified as male.宪法还赋予巴西的25个成员州很大的权力。The constitution also confers large powers on Brazil's 25 constituent states.这条规定赋予了总统绝对及不受约束的权力。This provision gives the ...