| 青石棉是世界卫生组织确认的一种致癌物质，是《鹿特丹公约》中受限制的46种化学品之一，青石棉的化学式为：Na2Fe5Si8O22（OH）2，青石棉用稀硝酸溶液处理时，还原产物只有NO，下列说法不正确的是（ ） A．青石棉是一种硅酸盐产品 B．青石棉的化学组成用氧化物的形式可表示为：Na2O•3FeO•Fe2O3•8SiO2•H2O C．青石棉中含有一定量的石英晶体 D．1mol青石棉能使1mol硝酸被还原 |
答案：C
| 根据对话内容，从方框中选择5个恰当的句子完成对话。 | |
| A: Good morning, madam. B: 1 A: You look worried. What's wrong with you? B: My daughter got lost when I did shopping in the market this morning. I've looked for her everywhere in the market, but I can't find her. What shall I do? A: 2 Tell us something about her. We can help you. B: Thank you, sir. A: Now please tell me how old she is. B: She's five years old. A: 3 B: She's kind of heavy, and she has a round face and long curly hair. A: What color dress is she wearing today? B: 4 A: What's your telephone number? B: It's 9256480. A: OK.We'll start to look for her right away. We'll call you as soon as we find her. B: 5 | |
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