问题 判断题

VoIP(Voiceover Internet Protocol),中文就是通过IP数据包发送实现的语音业务。

答案

参考答案:对

实验题

(15分)某研究小组用黄铜矿(主要成分是CuFeS2,其中S为-2价)为主要原料炼铜,其总反应为:2CuFeS2+2SiO2+5O2=2Cu+2FeSiO3+4SO2。事实上该反应是按如下流程分步进行的:

(1)氧化Ⅰ的反应主要是煅烧生成的硫化亚铁被进一步氧化为氧化亚铁,并与二氧化硅反应生成矿渣。矿渣的主要成分是     (填化学式)。

(2)据报道,有一种细菌在氧气存在下可以将黄铜矿氧化成硫酸盐,反应是在酸性溶液中发生的。该反应的化学方程式为     

(3)我国学者研究发现,以精CuFeS2矿为原料在沸腾炉中与O2(空气)反应,生成物冷却后经溶解、除铁、结晶,得到CuSO4·5H2O,生产成本能够降低许多。有关实验结果如下表:

沸腾炉温度/℃560580600620640660
水溶性Cu/%90.1291.2493.5092.3889.9684.23
酸溶性Cu/%92.0093.6097.0897.8298.1698.19
①CuFeS2与O2反应的化学方程式为     

②实际生产过程中沸腾炉温度为600~620 ℃。则控制温度的方法是     

③当温度高于600~620 ℃时,生成物中水溶性铜下降的原因是     

④生成物冷却后的除铁的实验操作方法主要是     。已知在溶液中,Cu2+开始沉淀和沉淀完全的pH分别为4.7、6.7,Fe3+开始沉淀和沉淀完全的pH分别为1.1、3.2;如果制得的硫酸铜溶液中含有少量的Fe3+,请写出除去溶液中Fe3+的实验操作步骤:     

阅读理解

The unwanted disturbing of a mobile phone ringing at a critical moment has led to some famously strong reactions

British actor Richard Grif-fiths,stopped a performance at the National Theatre and ordered The offending party to leave

Judge Robert Restaino went considerably further.He was hearing a session of domestic violence offenders in a court when proceedings were interrupted by rings of a phone.

“Everyone is going to jail unless I get that instrument now,” he shouted.

Over the next two hours,the judge entered a period of “incredible madness”.He began by ordering the doors of the court locked,and set the officers to searching for the phone.

When that failed to find the offending item he ordered each of the defendants(被告) present in the room up to his bench and in turn asked them if they  had no idea, he sent each in turn to jail(监狱).   

All 46 of them.

When a defendant protested the judge’s actions were not fair to those who didn’t possess the phone,Restaino replied:“I know it isn’t.

Judge’s actions caused chaos.Extra officers had to be drafted into the court to control the crowd.and booking officers at the city jail were at full stretch.“We were playing Twister in here”, one said at the time.

Fourteen of the defendants were shackled(束缚 )in irons and sent to the county jail.

The judge cooled off and later that afternoon released all 46.

The “two hours of viral lunacy(疯狂)”, has probably cost Restaino his job.The commission ruled that he should be removed from his $14,000 job.Restaino now has 30 days to appeal(上诉).

His lawyer pointed out that until that moment he had served 11 years as a judge without any disciplinary issues.“With the exception of two hours.his record is spotless.”

小题1:The underlined sentence in the passage means _____.

A.we are just playing games

B.we are struggling to control the crisis here

C.we can hardly survive the crisis

D.we’re searching casually小题2:Why is British actor Richard mentioned?

A.To indicate the disadvantage of mobile phone.

B.To scold the misusage of mobile phone.

C.To provide an excuse for Richard’s offence.

D.To support the opinion above小题3:Two hours of viral lunacy will_____

A.make Robert pay a large sum of money

B.make no difference to Robert

C.most likely make Robert lose his job

D.make him world famous小题4:What’s the best title of the passage?

A.Phone-rage(狂怒) judge

B.Judge,prisoner and mobile phone

C.The story in court

D.Mobile phone in court小题5:From the passage we can find_____.

A.Robert is always challenging the disciplines

B.Robert is now in jail

C.judge is not a well-paid job

D.all the defendants didn’t follow Robert’s instructions willingly