A:除去碳酸钠固体中混有的少量碳酸氢钠可以采用加热的方法
B:相同条件下,碳酸钠的溶解度小于碳酸氢钠的溶解度
C:碳酸钠与盐酸反应放出二氧化碳的剧烈程度强于碳酸氢钠
D:向碳酸钠溶液和碳酸氢钠溶液中滴加少量酚酞试液,都不显红色
My name is Tom. I come from England. I like to have friends who are different from me. My best friend is Paul. Paul is funnier, more outgoing and athletic than me. He always tells jokes and makes me laugh. We also like different things. He likes going to the movies. He likes playing sports. He likes pop music. But I like reading books. He often asks me to go to the movies and gives me some interesting books. And I often give him CDs. We often help each other.
分类学家们将地球上生物所有的生物按大小和从属关系可排列成( )等分类单位.