【简答题】Many cities around the world today are heavily polluted. Careless methods of production and lack of consumer demand for environment (环境) friendly products have contributed to the pollution problem. On...
【简答题】(12分)工业上以锂辉石(Li 2 O·A1 2 O 3 ·4SiO 2 ,含少量Ca、Mg元素)为原料生产碳酸锂。其部分工艺流程如下: 已知:①Li 2 O·Al 2 O 3 ·4SiO 2 +H 2 SO 4 (浓) Li 2 SO 4 +Al 2 O 3 ·4SiO 2 ·H 2 O↓ ②某些物质的溶解度( S )如下表所示。 T /℃ 20 40 60 80 S (Li 2 CO 3 )/...
【简答题】阅读理解 People of older generations often complain about the selfishness and lack of respect they find among the younger generations.It is undeniable that some young people do need to be educated on mutu...
【简答题】People of older generations often complain about the selfishness and lack of respect they find among the younger generations. It is undeniable that some young people do need to be educated on mutual r...