The welding conditions should always be neutral or slightly oxidizing.焊接气氛必须永远保持中性或微氧化.Alkanes are resistant to attack by oxidizing agents generally.烷烃一般对于氧化剂的作用是稳定的.In liquid mixtures tetranitromethane may be used as an...
有许多法律事务(尽管做起来也不是很容易)是主题变奏曲.Many legal tasks, although not quite easy, are a theme.海顿主题变奏曲,“圣·安东尼圣咏 ”Variations on a Theme by Haydn,'st Antoni Chorale "这位作曲家把一首简单的民歌小调改编成一首复杂的变奏曲.The composer transformed a simple fol...