在距地面高为h的光滑水平桌面上,一个轻弹簧左端固定,右端紧挨一质量为m的小球。用

题型:计算题

问题:

在距地面高为h的光滑水平桌面上,一个轻弹簧左端固定,右端紧挨一质量为m的小球。用小球压缩弹簧后放手,小球沿水平桌面滑动后落地,已知落地时速度为v,求小球压缩弹簧所做的功。

考点:功能关系
题型:计算题

I have returned to my hometown after I was away ten years ago. So many things have changed around here. It has become better and better. When I left here, there was a small pool on the right of my house. Now the pool has gone and people have built a large shopping mall(商场) there.

The biggest changes have taken place in the center of the city. There are sidewalks on both sides of the street. You can see a street center with so many tall buildings around. You can’t drive there any more because no vehicle is allowed to pass there. A European-style fountain(喷泉) has been built in the street center garden.

There used to be an old school near my house. I spent my five years studying there. There was a small payground in front of the school. But now what I can see are five tall buildings standing there. There are two big classroom buildings and a library. A new post office has also been built just across from the new school.

小题1:I have been away from my hometown for ________.

A.ten months

B.one year

C.five years

D.ten years小题2:On the right of my house, there was a _________ ten years ago.

A.library

B.garden

C.supermarket

D.pool小题3:No vehicle is allowed to pass the _________.

A.center of the city

B.old school

C.street center

D.playground小题4:Which of the following is WRONG(错的)?

A.A fountain is in the street center garden.

B.Now there is an old school near my house.

C.There are two big classroom buildings and a library in the new school.

D.There is a post office across from the school.小题5:What’s the best title for the passage?

A.Great Changes in My Hometown.

B.A Wonderful Place

C.What a Nice Town

D.My School.

题型:计算题

抽绎

题型:计算题

《周易》中的()倡导国民理解自然和人文。

A、贲卦

B、乾卦

C、井卦

D、坤卦

题型:计算题

甲亢最具有诊断意义的体征是

A.心率加快,第一心音亢进
B.弥漫性甲状腺肿伴血管杂音
C.突眼
D.胫骨前黏液水肿
E.脉压差大伴周围血管征

题型:计算题

RO进水要经过哪些预处理?

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