下列说法正确的是(N A表示阿伏加德常数) A．1molCu与足量硫反应生成Cu

发布时间：2017-04-30 19:37 │ 来源：www.tikuol.com

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问题：

下列说法正确的是(N_A表示阿伏加德常数)

A．1molCu与足量硫反应生成Cu₂S，转移的电子数为2 N_A

B．R²⁺的质量数为A，中子数为N，则ngR该价态的氧化物中含质子数为N_A

C．氯化铁生成Fe(OH)₃胶体的离子方程式：Fe³^＋+3H₂O =Fe(OH)₃↓+3H^＋

D．在加入铝片能生成氢气的溶液中一定共存的离子组：Na⁺、Ba²⁺、Cl^－、NO₃^－

考点：离子共存

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—I’m afraid I can’t pass the driving test tomorrow.

— ! I’m sure you’ll make it.

A．Go ahead

B．Good luck

C．No problem

D．Cheer up

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阅读下面5段语言材料，请找出与它们相对应的段落大意，并将其标号填入下列横线上。

1. Do you think you have a poor memory? The following
suggestions may help you improve. You may be able to get
better grades!
2. Be interested. Tell yourself that you want to learn what
you need to remember. If you keep thinking about how bad
your memory is, your brain will not be active. Think about
something hopeful.
3. Go over information often and "over-learn". Review
what you've learned the same day you learn it. Look back
on it from time to time. The more often you study the
information, the easier it will be for you to recall it.
4. If you're trying to understand something that's
especially difficult, try to get an overview; don't think too
much about the details. If you're able to explain it to
someone else in your own words, it shows you know it.
5. Do you stay up late? Do you take exercise? Good life
habits help your memory. Exercise brings you enough
oxygen (氧气) and makes your brain more active.

A. Having interest in what you learn.

B. Give you some suggestions.

C. Reviewing is very important.

D. Having a good life habit is helpful.

E. Understanding is necessary.

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题型：选择题

朋友和友谊是人生的永恒话题，我们渴望友情，寻找朋友，探求友谊的真谛，是因为朋友[ ]

A．能帮我们解决所有问题

B．能带给我们财富

C．能给我们支持和力量

D．能让我们感受生活的美好

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反常呼吸运动常见于

A．损伤性血胸

B．开放性气胸

C．多根多处肋骨骨折

D．闭合性气胸

E．张力性气胸

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题型：选择题

病毒主要有什么组成（）

A、蛋白质和核酸

B、蛋白质和DNA

C、蛋白质和RNA

D、核酸和核糖体

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