下列关于碳的单质及其化合物的用途与其所依据的性质不相符合的是

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问题选择题

下列关于碳的单质及其化合物的用途与其所依据的性质不相符合的是[ ]

A ．金刚石用于刻划玻璃：金刚石的硬度很

B ．活性炭用作冰箱除臭剂：活性炭具有吸附性

C ．一氧化碳用于冶炼生铁：一氧化碳具有可燃性

D ．干冰用于人工降雨：干冰升华时吸收大量的热

答案

答案：C

问答题

仔细观察图片，回答问题。

1. I lost my key. Can you find my key? Where is the key?

Yes. I can. Under the bed.

2. I lost my toothbrush. Can you find my toothbrush? Where is the toothbrush?

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3. I lost my shirt. Can you find my shirt? Where is the shirt?

____________________________________________________________________

4. I lost my ball. Can you find my ball? Where is the ball?

____________________________________________________________________

5. I lost my book. Can you find my book? Where is the book?

____________________________________________________________________

6. I lost my suitcase. Can you find my suitcase? Where is the suitcase?

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判断题

滚动轴承实现轴向预紧，就是要采取各种方法使其内、外圈产生相对位移，以消除游隙。