以工业氧化铝 、 结合粘土 、 蓝晶石等为原料,应用聚苯乙烯球烧先注和可塑成形法研制成功了耐火隔热砖. The refractory insulating bricks were produced , taking alumina, soft clay, cyanite al as raw materials.
Authority thereof shall issue Writs of Election to fill such Vacancies.管理局须发出令状的选举,以填补这些空缺.Writs of arrest were issued for a thousand students throughout the country.全国各地有一千名学生被拘捕.This article concludes that the common l...