(1)如图1,画出悬挂在枝头的苹果所受力的示意图; (2)如图2所示,在课桌的A

题型:应用设计题

问题:

(1)如图1,画出悬挂在枝头的苹果所受力的示意图;

(2)如图2所示,在课桌的A点用最小的力把桌腿B抬离地面,在抬时桌腿C没有滑动,请画出这个力的示意图,并标出它的力臂L.

考点:力与运动的关系
题型:应用设计题

在一个气候环境多变的生态系统中,生存机会最多的种群是[ ]

A.个体最大的种群  

B.个体最小的种群  

C.个体差异最少的种群 

D.个体差异最多的种群

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     Almost everyone loves trees, but do you know that tree can help sick people recover faster?

     It's true. According to the International Society of Arboriculture (树木培植), hospital patients have

been shown to recover faster when they are given a view with trees. Also, while trees certainly benefit

any landscape, whether lining streets, decorating urban areas, or growing naturally in the forest, they are

actually important in our daily lives.

     Trees improve the quality of the air around us by absorbing dust and other particles(颗粒物). Their

leaves also absorb harmful gases before we have a chance to take them in. They also protect us from the

sun, rain, hail(冰雹), and snow, which can quickly damage unprotected homes. Even better, they often

clean oxgiygen for us to breathe.

     Trees make economic sense. A home surrounded by trees costs less to cool and heat.

Neighborhoods with trees are often several degrees cooler in summer than those in similar climates that

don't have trees.

In winter, trees can keep houses warmer by blocking strong winds. Also, less water is needed to water

grass and gardens in tree-shaded areas where the sun isn't constantly shining.

     Besides that, trees can further improve privacy, block unpleasant views, and increase the value of

your home. Unfortunately, these days, construction projects tend to wipe out all the trees in an area

before creating new neighborhoods and buildings. That's more important than ever to plant a tree in

your community.

1. The best title of the passage is about______.

A. planting a tree in your community

B. planting a tree in your family

C. improving people's privacy

D. improving people's life

2. Trees change the quality of air because______.

A. they can protect us from natural disasters

B. they can take in much dust and other particles

C. they often clean oxgiygen for us to breathe

D. they are of great importance in our daily life

3. According to the passage, we know that ______ is wrong.

A. trees can offer people a good place to cool

B. trees can make people get warmer

C. trees can bring people many benefits

D. trees are likely to be damaged by people

题型:应用设计题

福柯

题型:应用设计题

对于投资者来说,非累积优先股股息收入的稳定性差。( )

题型:应用设计题

残余应力

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