Using calcium chloridize and sodium phosphate dibasic, this paper synthesizes hydroxyapatite having hexagonal system at 40 ℃.本文以氯化钙和磷酸氢二钠为原料,在40℃温度下合成了具有六方晶系的羟基磷灰石.Under proper condition the dibasic alcohol and bisphenol...
We want to recreate the romance and excitement that used to be part of rail journeys.我们想再度营造以前坐火车旅行的浪漫和兴奋。Like many cities in Germany, it had to recreate itself after the second world war.像德国很多城市一样,它不得不在第二次世界大战后进行重建。...a...