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.
Some suppliers were selling at a loss to shift stock.一些供应商赔本销售存货。My throat was dry. I was at a loss for words.我喉咙很干，不知说什么才好。I was at a loss for what to do next.下一步该怎么做，我完全没谱。...
We could make a whole plain white with skulls in the moonlight!我们便能令月光下的平原变白,遍布白色的骷髅!Objective : To evaluate the imaging features of subperiosteal hematoma of the skulls.目的: 探讨颅骨骨膜下血肿的影像特征.Some of the skulls were cut off...
今夜闹市区交通繁忙。There is heavy traffic in the downtown area tonight.他从小在巴拿马城中心闹市区的穷街陋巷里长大。He was raised on the mean streets of the central market district of Panama City.汽车向第九路飞驰,然后又转向闹市区.The car sped up to Ninth Avenue and tu...
The characteristic indexes of Daqu aroma - producing capability include ammoniacal nitrogen and the specific consumption of amylum.氨态氮和淀粉消耗率为大?生香力的特徵指标.Among all the leachingtechnologies investigated , acid leaching, amm...