固相反应的产物与单体矿物的主要区别是什么？
烂尾房
To avoid scavenge fires occurring the engine timing and equipment maintenance （）. ["should be correctly carried out","should correctly be taken place","should carried with care","must to carry out with great care"]
简述高等学校学生的基本社会特征。
固相反应的条件是什么？
简述固相反应的机理。
