The speech which he made __________ the ? The speech which he made __________ the project has bothered me greatly. A) being concerned B) concerned C) be concerned D) concerning
【简答题】(12分)碱式碳酸铝镁[Mg a Al b (OH) c (CO 3 ) d ·x H 2 O]常用作塑料阻燃剂。 (1)碱式碳酸铝镁具有阻燃作用,是由于其受热分解需吸收大量热量和 。 (2)Mg a Al b (OH) c (CO 3 ) d ·x H 2 O中a、b、c、d的代数关系式为 。 (3)为确定碱式碳酸铝镁的组成,进行如下实验: ①准确称取3.390g样品与足量稀盐酸充分反应,生成C...