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...
I have a bad roughening of the skin.我皮肤非常粗.The roughening process of unsaturated polyester resins and its technological criterion were described.介绍了不饱和聚酯树脂的粗化工艺流程及各工艺规范....