集体是我们每个人的集体，只有人人都主动关心、爱护集体，为集体建设出力，集体才会真

某同学按下列步骤对一种无色溶液进行鉴定实验.请你根据他实验报告中的步骤和现象，填写相应的实验结论（该溶液只含有一种溶质）.

实验步骤	实验现象	实验结论
⑴取该溶液少许，向其中加入几滴酚酞试液。	溶液没有颜色变化。	该溶液一定不显________性。
⑵另取该溶液少许，向其中加入锌粒，并把燃着的木条放在试管口。	有无色气体放出，该气体能燃烧，火焰呈淡蓝色。	生成的气体是________；说明该溶液中的溶质属于________类。
⑶再取该溶液少许，向其中加入稀盐酸，再加入适量溶液。	加入盐酸没有明显现象，加入溶液后有白色沉淀产生。	白色沉淀是________；说明原溶液为________溶液。

便隐血试验阳性，提示消化道出血量在

A．50～l00ml
B．20～30ml
C．＞5ml
D．70～100ml
E．＜400ml以上

In today’s throwaway society，dealing with the city’s growing mountain of waste is an increasing challenge for the city council (市议会)．

Recently，Edinburgh is faced with the problem of disposing of (处理) about 250,000 million tons of waste a year.Despite different ways to dispose of much of it in a green manner—largely through encouraging recycling—its aging facilities such as the Powderhall landfill do not have the ability to deal with it.

The European Union (EU) has issued a new policy，regulating how such mountains of waste are to be disposed of.The five councils (Edinburgh，East Lothian，West Lothian，Midlothian and Borders) face fines around ￡18 million a year from 2013 if they don’t increase recycling levels and rely less on landfill.With this in mind，the councils got together with the idea of building a large incinerator plant (垃圾焚烧厂) to burn half of the waste produced in their districts.But this plan fell apart after the change of target levels by a new UK government waste policy which required that no more than 25% of the city’s waste should be disposed of in this way by 2025.

After the plan was abandoned，a private company which already transported millions of tons of the city’s waste by train to a landfill site near Dunbar，offered an

alternative solution when it suggested opening a huge waste site near Portobello.

Since Powderhall is supposed to close in 2015，it seemed necessary for the members of the Edinburgh Council to accept the suggestion.But soon they turned it down—after 700 local objections reached them—because it would have meant hundreds of lorries a day making loud noise through heavily populated areas.

That still leaves the council with a problem.By 2013，only 50% of 1995 levels of waste will be allowed to be sent to landfill.Even if recycling targets are met，there will still be a large amount of rubbish to be burnt up.Due to this，Edinburgh and Midlothian councils have now decided to work together to build an incinerator plant as time to find a solution is fast running out.(2011·湖北，C)

小题1:The main way of handling waste in a green manner in Edinburgh is ________.

A．recycling

B．restoring

C．burying

D．burning小题2:The five councils worked out a plan to build an incinerator plant to ________.

A．reduce the cost of burying waste

B．meet the EU requirements

C．speed up waste recycling

D．replace landfill sites小题3:The city council of Edinburgh rejected the suggestion to open a huge landfill site near Portobello because ________.

A．it came from a private company

B．the council was not interested in it

C．it was not supported by EU

D．the local people were against it小题4:What is the final decision of Edinburgh and Midlothian councils?

A．To open a new landfill nearby.

B．To close the Powderhall landfill in 2015.

C．To set up a plant for burning waste.

D．To persuade people to reduce their waste.

设|x|≤1，由Lagrange微分中值定理，存在θ∈(0,1)，使

试证：

额定漏电动作电流不超过３０ｍＡ的漏电保护器，在其他保护措施失效时，可作为直接接触的补充保护，但不能作为唯一的直接接触保护。