The synthesis methods of magnesia - alumina spinel are electro - fusion and sintering process.镁铝尖晶石的合成方法有电熔法和烧结法.Magnesite deposits account for approximately 80 % of total magnesia production.大约80%的氧化镁产量来自菱镁矿.A substance...
他心情非常烦乱，嘴里咕咕哝哝地咒骂着。He was in a right tizzy, muttering and swearing.汽车飞驰而去，留下我在那里大声咒骂。I was left shouting abuse as the car sped off.他冲我高声咒骂。He screamed unholy things at me....