Without the instrumentality of a free press liberty could not be preserved.如果不能有效地利用新闻自由,就无法维护自由.Through the instrumentality of the police he was able to locate his relatives.靠警察帮忙,他找到了他的亲属.One that serves as a means; an...
Comparing with polyurethane, the prospects of the applications of isobutene telechelic oligomer are presented.并与聚氨酯材料相比较;说明了聚异丁遥爪预聚物的主要应用前景.Tert - octylamine was prepared with di - isobutene and hydrocyanic acid as mine ...