在此条件下合成的产物中活性物含量可达40%.Under the optimum conditions, the content of active substance could reach 40 %.其固体物的质量分数为25%,活性物质量分数为18%.Its solid was 25 % and the activating agent was 18 %.对以氟化钠和一氟磷酸钠为基础的 抗 龋活性物配方的有效性给予了肯定.The ef...
To avoid extra expense and mess later on, try to decide on fittings before the plastering's finished.为避免将来出现额外的开支和不必要的麻烦，尽量在抹灰完工之前把固定设施确定下来。Sue's cousin was plastering the ceiling in a dank basement.苏的表弟当时正在一间潮...