用简便并能产生明显现象的化学方法,分别鉴别下列两组化合物(用流程图表示鉴别过程):

题型:问答题

问题:

用简便并能产生明显现象的化学方法,分别鉴别下列两组化合物(用流程图表示鉴别过程):
(1)苯胺、苯酚、苯甲酸;
(2)异丁醇、仲丁醇、叔丁醇。

考点:普通考研农学联考农学硕士联考化学
题型:问答题

鲍温病病因学中的致病因素包括()。

A.砷剂

B.日光

C.外伤

D.慢性皮肤病

E.遗传

题型:问答题

阅读下面的文字,回答问题。

上海世博会触摸高科技发展“新脉动”

  ①荟萃国内外科技创新及新成果的上海世博会,将让人们现场触摸到当今高科技发展的“新脉动”。精彩纷呈的“创新、创意”,有望借助世博效应的扩散,成为我国科技发展,产业转型的重要助推力。     

  ②上海世博会是展示人类文明生活,社会发展理   念和科学技术成就的一个大盛会。众所瞩目的“三网融合”有望首次落地实施。上海市将率先实现50万户的联通,让用户在实时互动中体验“网上世博”,同   时还可以领略“沪上人家”的魅力,机器人炒菜,端盘子……看一看未来的生活、未来的信息技术给我们带来怎样的方便。     

  ③世博园区内布设的第四代移动通信技术TD-LTE试验网,将是世界上第一张基于此项技术的4C试验网,通过这一世界领先移动通讯技术,参观者可以通过无线网络,即时进行大流量的视频传输,网络下载等。     

  ④在新能源方面,世博会5.8平方公里的场地将成为当今世界上最大的太阳能应用场所,有4.6兆瓦的太阳能光伏并网发电装置,其中,一个世界最大的屋顶电厂主题馆,就有将近2.6兆瓦的太阳能发电装置。在东海大桥建设的34个3兆万的风力发电机,届时并网发电后,也将为世博会输出清洁能源。     

  ⑤低碳排放方面,上海世博会将继北京奥运会后继续实现园区内的交通零排放。园区内外配备了各种各样的电动汽车,如氢能源汽车,超级电容汽车,纯电动汽车等;世博会“一轴四馆”所有的雨水进行100%回收再利用,“世博轴”项目实现了依靠黄浦江水、地源热泵、雨水收集系统来调节空气,“一轴四馆”同时成为世界上最大的LED高效照明区。   

  ⑥“电子标签”技术将为手持门票的参观者带来惊喜。世博会人员流量大而且集中,物流周期长,因此集成了一大批先进电子信息技术应用于运营管理中,例如世博会的数千万张门票都会应用射频识别技术,也就是人们俗称的“电子标签”技术,人均通过世博园区入口闸机时间不超过20秒。    

  ⑦智能交通将为人流、车流的顺畅护航。世博会的智能交通系统能够保证交通高峰时段,上海主城区及换乘点交通信息发布和引导更新频率不超过5分钟。上海的停车换乘(P+R)动态诱导系统将覆盖全城,200个车位以上公共停车场库动态信息采集和发布在内环线内全覆盖、在外环线内70%覆盖。(选自《半月谈》2010年第7期,有删改)

1.文章说明了高科技将在世博会上的应用,选出表述不正确的一项是(    )  

A.“三网融合”有望首次落地实施。   

B.智能交通将为人流、车流的顺畅护航。   

C.在新能源方面,只有太阳能将为世博会输送清洁能源。   

D.“电子标签”技术将极大缩短人口闸机时间。

2.第④段中画线的句子运用了哪些说明方法?并分别说明它们的作用。    

________________________________________  

3.指出第⑦段中加粗词在句子中的作用。  

________________________________________                    

4.“低碳”问题关乎千家万户,低碳生活应成为一种习惯。请你围绕“低碳”问题,以整齐的句式写一条宣传标语。示例:熄灭的是灯光,点亮的是希望。

________________________________________   

题型:问答题

When buying from a dealer, the law says that a car must be:

As described:

This includes the history of the car as well as its specification. For example, if the dealer described the car as previously having “one careful lady owner”, it shouldn’t turn out to have had several previous “boy racer” owners.

Of satisfactory quality:

It must meet the standard that a reasonable person would regard as acceptable and be free from any quality problem. Also, bear in mind that a second-hand car will have a slightly different definition of what is considered “satisfactory, because there’s certainly an element of wear and tear.

Fit for the purpose:

It must be reasonable fit for any normal purpose and this includes any purpose that you specify to the seller.

●If any of the above is violated, then in theory, you may have the right to reject the vehicle and get your money back if you’re reasonably quick. Alternatively, the dealer might offer to replace or repair the car; reduce the price of offering a partial refund(退款). Once you’ve informed the dealer that you wish to reject the car, you must stop using the vehicle.

●If the rejection is not accepted, then it’s up to you to prove your case. You’ll need to pay for an independent assessment of the car and sue for damages. If you do choose a repair, insist the dealer provide you with a hire car or pay any reasonable traveling expenses thus produced while your new car is in the garage.

●If the car is new, it’s likely that the claim will be too high to be fought. Using the small claims procedure to you may have to pay for legal representation. All this can be pretty daunting and expensive. You need to weigh up the pros and cons before rejecting a car. Would a repair do just as well? Selecting a dealer who offers a clear exchange policy may help.

小题1:After the above writing, you will be better at           .

A.choosing a car

B.dealing with car sellers

C.making a claim

D.suing for damages小题2:According to the text, what is essential after you inform the dealer of your wish to reject the car________?

A.Suing for damages.

B.Demanding traveling expenses.

C.Stopping using it.

D.Proving your case.小题3:If the dealer offers to repair the car you have bought, which of the following is acceptable_______?

A.Asking the dealer to provide you with a hire car.

B.Asking the dealer to provide you with repair tool sets.

C.Asking the dealer to pay all of your traveling expenses.

D.Asking the dealer to return all your money.小题4:Which of the following words has the closest meaning to the underlined word “daunting” in the last paragraph________?

A.Different.

B.Effective.

C.Discouraging.

D.Convenient.小题5:What does the writer want to say in the last paragraph_________?

A.Buyers should select a dealer that offers to repair the car.

B.Rejecting a new car is not necessarily the best choice.

C.It’s necessary that a new car should be repaired.

D.Buyers should never reject a new car.

题型:问答题

下列哪项是最常见的产力异常()

A.不协调性宫缩乏力

B.协调性宫缩乏力

C.协调性宫缩过强

D.不协调性宫缩过强

E.不规则子宫收缩

题型:问答题

微型计算机中,普遍使用的字符编码是( )。

A.补码

B.原码

C.ASCII码

D.汉字编码

更多题库