Boron - substituted polyaromatic mesophase prepared by co - pyrolysis of a tar pitch with pyridine - borane complex under autogeneous pressure. 以煤焦油沥青和吡啶硼烷为原料采用加压热缩聚工艺制备硼取代聚芳烃中间相沥青.
Eddies of dust swirled in the road.路上尘埃滚滚.Meridional heat transfer by large - scale eddies is most significant in the upper troposphere of middle latitude.大尺度湍涡的子午线热输送在纬度对流层上层是最重要的.But their work appears to merge in the ...
of pleasing mien有惹人喜欢的仪表with a sorrowful mien带着忧伤的神色With his wonted , collected and stately mien, he crossed the unhallowed threshold.他摆出平时那种泰然自若的庄严态度, 跨过那个污浊的门槛....his mild manner and aristocratic mien.他温文尔雅的举止和高贵风度It w...
Douglas was a 29-year-old journeyman fighter, erratic in his previous fights.道格拉斯29岁，是个技术不错的拳击手，在以前的比赛中发挥不太稳定。The man was known to the police because of previous convictions.因为有犯罪前科，警察们都认识这个人。CBS's ratings again sho...