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问题 单项选择题

信息产业部电子教育与考试中心(全国电子信息应用教育中心)在其网站开通计算机技术与软件专业技术资格(水平)证书查询服务，属于______模式。

A．G2B

B．G2C

C．G2E

D．G2G

答案

参考答案：B

解析：[要点解析] 信息产业部电子教育与考试中心通过网络向公众(计算机技术与软件专业技术资格(水平)证书执有者、各用人单位等)提供证书查询管理和防伪服务，属于政府对公众(Government to Citizen，G2C)模式。

不定项选择

我国某市考古队在一次考古中发现了一古生物骸骨，考古专家根据骸骨中的含量推断出该生物死亡的年代。已知此骸骨中的含量为活体生物中的，的半衰期为5700年，请问：该生物死亡时距今约[ ]

A.1420年

B.2850 年

C.5700年

D.11400年

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多项选择题

Passage 1If you have never seen a power plant, you might find it hard to imagine how enormously complex the equipment is or how much heat is generated by the boilers or how much coal it takes to fuel the furnaces for just one day.During the course of a day, the boilers at one of our power plants, Morgantown, for example, can turn 24 million gallons of water into steam. That generating plant alone uses 9,900 tons of coal in its furnaces in just one day. Potomac Electric Power Company (PEPCO) uses so much coal that we have purchased two 80-car unit trains to facilitate the delivery process. And Morgantown alone can produce over 25 million kilowatthours of electricity in a single day’’s operation.Electricity is produced by spinning large magnets inside a coil of wire within the generator. The faster we spin the magnets, the higher will be the voltage of the electricity produced. Electricity leaves a PEPCO generator at between 13,800 and 24,000 volts.The next step in the process occurs when electricity passes through a transformer where the voltage is stepped up to continue on its journey. A transmission wire is like a small diameter pipe. Stepping up the voltage is like increasing water pressure, thus speeding the flow of energy through the system.Passage 2Because the aircraft industry needs ever-increasing quantities of aluminium plate, new equipment has been designed to automate the making of it. It includes a huge heat-treatment furnace, a crane that lifts hot metal plates without damaging them, and a computer system that can manage the complete flow of work.Five years ago, Europe’’s aircraft industry needed only 8,000 tonnes of aluminium plate a year for its products. Last year the figure reached 21,800 tonnes. By 2004 it should total 30,000 tonnes. Each airliner contains 180 tonnes of it. That is why the plant is being rebuilt to increase both the quality and the amount of its product.Aluminium is alloyed with other metals and cast into ingots, and the surface of the ingots is smoothed off. After pre-heating, it is rolled in a mill that can take 3.75-m-wide slabs. The new equipment can make the process more efficient and can produce a better product. For example, computers control the temperature of the hot plates, the rate at which they pass through the mill, the speed of cooling it with water, and so on.The new plant can handle twice the throughput of the one that it is replacing, thanks to the completely automated and computerized process.
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