试题与答案

(1)用多用电表的欧姆挡测量阻值约为几十kΩ的电阻Rx,以下给出的是可能的操作步

题型:实验题

题目:

(1)用多用电表的欧姆挡测量阻值约为几十kΩ的电阻Rx,以下给出的是可能的操作步骤,其中S为选择开关,P为欧姆挡调零旋钮,把你认为正确步骤前的字母按合理的顺序填写在横线上________.

a.将两表笔短接,调节P使指针对准刻度盘上欧姆挡的零刻度,断开两表笔

b.将两表笔分别连接到被测电阻的两端,读出Rx的阻值后,断开两表笔

c.旋转S使其尖端对准欧姆挡×1 k

d.旋转S使其尖端对准OFF挡,并拔出两表笔

(2)正确操作后,多用电表的指针位置如图所示,此被测电阻Rx的阻值约为________Ω.

答案:

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参考答案:骑士早期教育

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     Walking is a great way to get in shape without breaking the bank (it's free and you do it every day).

It benefits people physically, psychologically and socially. Here are how:

    Keeps You in Good Health

     In terms of health, walking is the key to managing weight, controlling blood pressure, and reducing the

risk of a stroke, breast cancer, and many other illnesses. A quick and energetic daily walk lengthens your

life, decreases the risk of disappointment and keeps up your mood and sense of wellbeing.

    Keeps You Mentally Refreshed

    From a psychological viewpoint, walking offers an opportunity to clarify thoughts, to solve problems

and to reduce stress. If you take a walk that is relaxing and peaceful, walking can also become a form of

meditation(冥想).

     Allows for Social Relationship

     Walking regularly with someone else enables a friendship to develop as the pair of you exercise.You

can also schedule regular walk "dates" with your partner and use the time to discuss questions without

being disturbed.

     Lets You See the World Around You

     Also, the best way to explore some of the world's great cities-such as New York, London, Paris and

Rome-is on foot. Walking motivates the senses and enables you to enjoy a rich life around you.

Wordsworth, who is believed to have travelled around the world seven times during his lifetime, always

delighted in the truth that "going for a walk is an invitation for surprise".

    Here are some tips to get going:

    Get a walking partner and meet each week at a set time.

    Get a dog and you'll have a constant walking companion.

    Choose a spot that is charming but accessible.

   Start with a soft walk, then increase the pace and distance.

   Include some hills and stairs.

    Use an umbrella if it rains: the worst that can happen is that you get wet!

1. What is the best title of the passage? (No more than 10 words)

________________________________________________________________________

2. What does the underlined word"schedule"mean? (No more than 5 words)

________________________________________________________________________

3. How does walking keep us mentally healthy? (No more than 20 words)

________________________________________________________________________

4. Why does the author take Wordsworth for an example in the ninth paragraph? (No more than

    30 words)

________________________________________________________________________

5. What is the best way for us  to explore the world's great cities? Why? (No more than 20 words)

________________________________________________________________________

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