高起始响应励磁系统为电压响应时间小于或等于0.2s的交流励磁机励磁系统。

除了听觉系统外，噪音还可以对人体产生哪些损害。

进行相关与回归分析应注意对相关系数和回归直线方程的有效性进行检验。（）

利用图示装置进行验证机械能守恒定律的实验时，需要测量物体由静止开始自由下落到某点时的瞬时速度v和下落高度h，某班同学利用实验得到的纸带，设计了以下四种测量方案。

A．用刻度尺测出物体下落高度h，并测出下落时间t，通过计算出瞬时速度

B．用刻度尺测出物体下落的高度，并通过计算出瞬时速度。

C．根据做匀变速直线运动时纸带上某点的瞬时速度，等于这点前后相邻两点间的平均速度，测算出瞬时速度，并通过计算出高度

D．用刻度尺测出物体下落的高度，根据做匀变速直线运动时纸带上某点的瞬时速度，等于这点前后相邻两点间的平均速度，测算出瞬时速度

小题1:以上方案中只有一种最合理，最合理的是         。（填入上述相应的字母）

小题2:要使该实验误差尽量小，下述注意点正确的是     （填入下述相应的字母）

a.使重锤的质量越大越好，但悬挂时不能拉断纸带

b.选用电火花计时器比电磁打点计时器更好，可减小阻力影响

c.测长度时保持纸带悬挂状态，刻度尺的读数更准确

d.纸带上留下的点越大越好

e.纸带长一点更好

阅读理解。

     A man accused of failing to return more than 700 children's books to five different libraries in the county

was released from prison after a book publisher agreed to post his bond (保释金) of $1,000. The publisher

said. "There's a story here. This is a man who loves books. He just can't let go of them. He hasn't stolen a

single book. So what's the crime? We think that Mr. Banish has a story to tell. We plan to publish his story."

     When asked why he didn't return the books. Mr. Banish said, "Well, how could I? They became family

to me. I was afraid to return them, because I knew that kids or dogs would get hold of these books and chew

them up, throw them around, tear the pages, spill soda on them, get jelly and jelly on them, and drown them

in the toilet.

     He continued, "Books are people, too! They talk to you,they take care of you, and they enrich you with

wisdom,humor and love. A book is a guest in my home. How could I kick it out? I repaired torn pages. I

dusted them with a soft clean cloth. I turned their pages so they could breathe and get some flesh air."

     "Every week I reorganized them on their shelves so they could meet new friends, My books were happy

books. You could tell just by looking at them. Now they're all back in the libraries, on the lower shelves, on

the floors, at the mercy of all those runny-nosed kids I can hear them calling me. I need to rescue them.

Excuse me. I have to go now."

1. Why was the man put into prison? [ ]

A. Because the book publisher persuaded the police to do so.

B. Because he stole 700 children's books from the five different libraries.

C. Because he refused to return the books that he had borrowed.

D. Because he wanted to publish his story.

2. How did the man treat books? [ ]

A. He treated them as real people.

B. He treated them as his own children.

C. He treated them as his furniture.

D. He treated them as his job.

3.From the passage we can learn that the man is _____. [ ]

A. a thief

B. a writer

C. crazy about books

D. unfortunate

4. What might happen after the man was set free? [ ]

A. He might stop borrowing books.

B. He might start a library of his own.

C. He might go on borrowing books from libraries.

D. He might return all his books

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