We've been pals for years.我们是多年的哥们儿了。David had been on a pub crawl with pals from his rugby club.大卫曾和他橄榄球俱乐部的朋友们一起串酒吧喝酒。When a political columnist describes a cabinet minister in slavishly adoring terms, shouldn...
用各种稀的无机酸来萃取阴离子.A variety of dilute mineral acids are used to extract the anions.它对氟离子的选择性比其它普通阴离子高几千倍.It'shows a thousandfold selectivity for fluoride over other common anions.通常, 钙素过量是与该元素相联系的阴离子伴随产生的.In general, e...