A:铝热剂就是单指Fe2O3粉末和铝粉的混合物
B:检验从火星带回来的红色物质是否为Fe2O3的操作步骤为:样品→粉碎→加水溶解→过滤→向滤液中滴加KSCN溶液
C:分别还原a mol Fe2O3所需H2、Al、CO物质的量之比为3∶2∶3
D:明矾属于硫酸盐,含结晶水,是混合物
如图表示生态系统中各成分之间的关系,请据图回答:
下面各图是课本上的一些插图,对下列插图的说明正确的是( )
Mrs. Smith is Jim's mother. She loves her family very much. She goes to the store every day. She often buys food, fruit and clothes for Jim and her husband(丈夫). Now many clothes are on sale at Renmin Clothes Store. They are very cheap. Mrs. Smith comes to the store and she wants to buy some clothes for her family. There they have sweaters in all colors for ¥15 each and sports shoes for only ¥28. Mrs Smith likes the red sweater and she buys one for herself. She buys a pair of sports shoes for her son. The great T-shirts in the store are just ¥18! She buys a white one for Mr Smith. And that's not all. The socks, in all colors, are ¥2 each. She buys the socks in many colors for her family. She is really a Rood mother and a good wife (妻子)