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...
a cup of char一杯茶Toast hazelnuts on a baking sheet until the skins char.在烘板上将榛子烤至表皮微煳。Halve the peppers and char the skins under a hot grill.将甜椒剖成两半,在滚热的烤架上烤至外壳微焦。It had clean whitewashed walls, a table and a char.屋里有白白的墙...