将质量为m的小球在距地面高为h 处逆风水平抛出,抛出时的速度大小为v0 .小球落

题型:不定项选择

问题:

将质量为m的小球在距地面高为h 处逆风水平抛出,抛出时的速度大小为v0 .小球落到地面时的速度大小为2v0 .则对于小球下落的整个过程,下列说法中正确的是[ ]

A.小球克服空气阻力做的功大于

B.小球的飞行时间为

C.合外力对小球做的功小于

D.水平位移等于

考点:平抛运动机械能守恒定律
题型:不定项选择

阅读理解。

    Three men travelling on a train began a conversation about the world's greatest wonders.

    "In my opinion," the first man said, "the Egyptian (埃及的) pyramids ( 金字塔) are the world's greatest

wonder. Although they were built thousands of years ago, they are still standing. And remember: the people

who built them had only simple tools. They did not have the kind of machinery (机械) that builders and

engineers have today.

     "I agree that the pyramids in Egypt are wonderful," the second man said, "but I do not think they are the

greatest wonder. I believe computers are more wonderful than the pyramids. They have taken people to the

moon and brought them back safely. In seconds, they carry out mathematical calculations (计算) that would

take a person a hundred years to do.

     Then the second man turned to the third man and asked, "What do you think is the greatest wonder in the

world?

     The third man thought for a long time, and then he said. "Well, I agree that the pyramids are wonderful,

and I agree that computers are wonderful, too. However, in my opinion, the most wonderful thing in the world

is this thermos." And he took a thermos out of his bag and held it up. The other two men were very surprised.

"A thermos?" they exclaimed (惊叫). "But that's a simple thing."

     "Oh, no, it's not," the third man said. "In the winter you put in a hot drink and it stays hot. In the summer

you put in a cold drink and it stays cold. How does the thermos know whether it's winter or summer?"

1. The underlined word "thermos" means _____. [ ]

A. fridge

B. air-conditioner

C. electric fan

D. bottle which can keep liquids hot or cold

2. The three men could not agree on what the world's greatest wonder was because _____. [ ]

A. they couldn't think of anything really wonderful

B. they all had different criteria (标准)

C. they could not prove that their opinions were right

D. the journey ended too soon

3. The first man thought the pyramids were the most wonderful-things in the world because _____. [ ]

A. they were very beautiful

B. they were in Egypt

C. they had been built with every simple tools

D. they could do mathematical calculations

4. The third man thought a thermos was the most wonderful thing in the world because _____. [ ]

A. it lasted longer than the pyramids

B. it cost less than a computer

C. he thought it knew whether it was winter or summer

D. the other two men were surprised when he told them about it

5. The third man was not very clever because _____. [ ]

A. he could not think of anything to say

B. he did not understand how a thermos works

C. he did not think the pyramids were wonderful

D. he did not know anything about computers

题型:不定项选择

公众责任保险是指以损害公众利益的民事赔偿责任为保险标的的责任保险,又称为()。

A.公共责任保险

B.无过失责任保险

C.过失责任保险

D.普通责任保险

题型:不定项选择

发育的评价指标包括()

A.身高

B.体重

C.智力

D.第二性征

E.年龄

题型:不定项选择

在易燃易爆的场所、有腐蚀气体的场所和露天照明选择正确的灯具是()。

A.防爆型,密闭型,防水型

B.密闭型,防爆型,保护型

C.开启型,保护型,防水型

D.防水型,防爆型,开启型

题型:不定项选择

不属于项目组织计划范围的是( )。

A.角色与职责分手工

B.人员配备管理计划

C.组织关系图表

D.人员配合训练计划

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