某同学利用DIS研究电梯在竖直方向的运动.在电梯中挂一质量为3kg的重物,用力传

题型:问答题

问题:

某同学利用DIS研究电梯在竖直方向的运动.在电梯中挂一质量为3kg的重物,用力传感器测出悬绳的拉力F,得到如图所示的F-t图象.        

(1)根据图象判断电梯在不同时间段加速度、速度的变化 情况是:A时间段______;B时间段______;C时间段______.

(2)若电梯在t=0时由静止开始运动,请判断电梯的运动 方向,并请叙述理由.

考点:匀变速直线运动
题型:问答题

根据我国《保险法》的规定,保险公司的业务范围分为财产保险业务和人寿保险业务

题型:问答题

阅读理解。

     This is not a diet. It's a simple way to lose weight And you don't even have to give up the food you love

or join a gym. You just follow some habits that thin people have. Keep them, and you'll become thin.

      (1)Wake-up

      When you wake up in the morning, sit up slowly without using your hands. With legs straight out, bend

(弯曲) forward until you feel sore in your back. It will burn about 10 calories (热量单位, 卡路里).

      (2)Start with soup

      When you have a meal, order a clear soup, and have it before having the main food. In this way, you'll

feel fuller, so you'll eat less when the main food comes. 

      (3)An apple (or more) a day

      Apples are full of fiber (纤维) and water, so your stomach will want less. The study shows that people

who eat at least three apples a day lose weight.

      (4)Stand up and walk around

      Every time you use the mobile phone, stand up and walk around. Heavy people sit on average (平均) two

and a half hours more each day than thin people. This skill is very important as standing up and walking

around will burn 50 or more calories.

      Use these skills, and you will have a big weight loss.

1. What should we have first if we want to eat less main food?[ ]

A. Soup.

B. Ice cream.

C. Salad.

D. Cheese.

2. Why does eating apples make one's stomach want less food? [ ]

A. Because apples are delicious.

B. Because apples are full of fiber and water.

C. Because apples are sour.

D. Because only apples are filled with calories.

3. Which of the following may the author disagree? [ ]

A. Sitting up slowly without using your hands helps burn calories.

B. Eating apples every day is good for people's health.

C. You have to join a gym if you want to lose weight.

D. It' s good to walk around while talking on the mobile phone.

4. What's the purpose of the passage? [ ]

A. To give some advice on how to lose weight.

B. To advise people to eat apples every day.

C. To tell people how to enjoy a better life.

D. To advise people to give up bad habits.

5. In which part of a newspaper would you most probably read the passage? [ ]

A. Shopping.

B. Teaching.

C. Family.

D. Health.

题型:问答题

单位活期存款账户结清时,开户单位必须将全部剩余空白凭证交回()。

A、单独保管

B、上缴支行

C、撕毁

题型:问答题

一座塑料大棚中有6块大小相同的长方形菜池子,按照从左到右的次序依次排列为:1、2、3、4、5和6号,而且1号与6号不相邻。大棚中恰好需要种6种蔬菜:Q、L、H、X、S和Y。每块菜池子只能种植其中的一种。种植安排必须符合以下条件:

Q在H左侧的某一块菜池中种植。

X种在1或6号菜池子。

3号菜池子种植Y或S。

L紧挨着S的右侧种植。

以下哪项列出的可能是最符合条件的种植安排()。

A.1种植Y;2种植Q;3种植S;4种植L;5种植H;6种植X。

B.1种植X;2种植Y;3种植Q;4种植S;5种植L;6种植H。

C.1种植H;2种植Q;3种植Y;4种植S;5种植L;6种植X。

D.1种植L;2种植S;3种植Y;4种植Q;5种植H;6种植X。

题型:问答题

客专隧道与普通铁路隧道主要区别是什么?

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