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将Ag–AgCl电极[Eø(AgCl/Ag)=0.2222V]与饱和甘汞电极[Eø=

题型:单项选择题

题目:

将Ag–AgCl电极[Eø(AgCl/Ag)=0.2222V]与饱和甘汞电极[Eø=0.2415V]组成原电池,电池反应的平衡常数为()。

A、4.9

B、5.4

C、4.5

D、3.8

答案:

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参考答案:收历代诗文集、文学评论及词曲方面的著作。一人著作的集子称别集,多人著作合编一起的集子称为总集。别集,如李白的《李太白全集》:白居易的《白氏长庆集》、韩愈的《韩昌黎集》等。总集,如《昭明文...

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根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余选项.

                                                      Easy Ways to Keep Your Brain Sharp

    Everyone is forgetful, but as we age, we start to feel like our brains are slowing down a bit and

that can be a very annoying thing.__1__    Read on for some techniques worth trying.

1.__2__

     People who regularly made plans and looked forward to upcoming events had a 50 percent

reduced chance of Alzheimer's disease (早老性痴呆症), according to a recent study.__3__    

Something as simple as setting a goal to have a weekly coffee date with a friend will do.There's

evidence that people who have a purpose in life or who are working on long or shortterm goals

appear to do better.In other words, keep your brain looking forward.

2.Go for a walk.

     Mildly raised glucose (葡萄糖) levels can harm the area of the brain that helps you form

memories and physical activity can help get blood glucose down to normal levels.In fact, exercise

produces chemicals that are good for your brain.__4__    

3.Learn something new.

     Take a Spanish class online, join a drawing club, or learn to play cards.A study found that mental

stimulation (刺激) limits the weakening effects of aging on memory and the mind.But the best thing

for your brain is when you learn something new and are physically active at the same time.__5__   

Or go dancing with your friends.

A.Focus on the future.

B.This can be especially harmful to the aged.

C.It should be something like learning gardening.

D.So take a few minutes each day to do some reading.

E.But don't worry if your schedule isn't filled with lifechanging events.

F.Luckily, research shows there is a lot you can do to avoid those moments.

G.In other words, when you take care of your body, you take care of your brain.

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枝蔓状城市—以城市边缘化和信息技术、虚拟技术为特征的后现化城市,将既不会是奴隶社会的“城堡式”城市,也不会是封建社会的“城池式”城市,当然也会与现代工业社会高楼耸立的中心化城市相区别。
在枝蔓状城市布局中,即使是眼下北京绞尽脑汁建造起来的多层环状结构也将大不适应。中心化城市的各种弊端,诸如交通堵塞、人口拥挤、环境污染、空气浑浊、疾病易于传播、犯罪案件增多、居住环境恶化、管理难度增加和公众空间锐减等,限制了城市的进一步发展。而现代高科技可以自由地用虚拟空间、网络空间取代地理空间或物理空间,因此,人们也就没有必要再拥挤在一个地域。于是自然而然就开始了从市区向市郊的转移,许多工厂、学校、研究机构都迁向市郊。市区再也没有工厂和生产基地,而变成纯粹的物质交换和消费的场所。又由于信息技术、网络技术、电信技术的发展,中心化城市的传统布局被彻底打散。
现在世界各地迅速崛起许多边缘城市,就属于中心化城市的后现代演变。中心化城市逐渐演变为主城市和边缘城市。主城市和边缘城市相互联系、相互作用而又各自独立,它们更多的是经济、文化和教育上的紧密联系。城市的边缘化,就是城市由中心向四周的蔓延与扩展,扩展到与非城市区域相接壤的既是城市又是乡村的地区。这里,现代商业交易和办公活动也走向郊区化、边缘化。生产规模、生产程序、劳动力市场和销售状况呈分散状。主城市与边缘城市通过铁道、地铁、高速公路、航空路线等组成的多模式运输系统以及卫星天线进行沟通。
这种城市的边缘化在许多发达国家已经形成规模,比如今天的美国就已经形成大洛杉矶都市区以及波士顿—劳伦斯—洛厄尔、旧金山—奥克兰—圣何塞等都市区。它们还会进一步向周边地区扩展,通过原料网、生产网、销售网、消费网、信息网和电脑网的连接而延伸到整个地球,成为[ ]的全球化城市。

加点词语“这里”指的是( )。

A.城市的边缘化

B.既是城市又是乡村的地区

C.主城市

D.边缘城市

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