仔细观察矿泉水瓶盖,我们可以发现这些瓶盖表面一般都有很多细密的竖或横的条纹,做这

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问题:

仔细观察矿泉水瓶盖,我们可以发现这些瓶盖表面一般都有很多细密的竖或横的条纹,做这些条纹的作用是为了(  )

A.增大扭瓶盖的压力

B.增大扭瓶盖的压强

C.增大扭瓶盖的摩擦力

D.增大瓶盖对手的支持力

考点:增大或减小摩擦的方法
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用所给的词的正确形式填空。

1. A: What are you doing for vacation?    

    B: I'm going fishing and swimming for vacation.    

    A: That ______ (sound) nice.   

2. A: What are you doing there?    

    B: I'm ______ (take) walks after supper in the evening.   

3. I don't like ______ (eat) junk food.   

    I eat it only three ______ (time) a month.   

4. A: What did you do last night?   

    B: I ______ (watch) TV.    

    A: How long ______ you ______ (watch) it?   

    B: I ______ (watch) it just for half an hour.   

5. A: What ______ your father do on Sundays?    

    B: He often ______ (read) newspapers.

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(10昆明6.)食品安全关系人民的健康,下列做法或说法正确的是

A.用工业用盐NaNO2腌制火腿

B.用甲醛水溶液浸泡水产品

C.食用清水洗过的霉变大米

D.水果中含有丰富的维生素,有益人类健康

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开普勒六参数有as、es、V、Ω、I和ω。61、预报星历通常包括()和轨道摄动项参数.

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( )是当事人双方在争议发生前或争议发生后达成协议,自愿将纠纷交给第三者,由第三者做出裁决的一种解决纠纷的方式。

A.和解

B.调解

C.仲裁

D.诉讼

题型:选择题

______ of the students ride bikes to school, but ______don’t.[ ]

A. Most, another

B. Some, others

C. lot, the other

D. Many, the other

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