如图所示,在置于匀强磁场中的平行导轨上,横跨在两导轨间的导体杆PQ以速度v向右匀

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问题:

如图所示,在置于匀强磁场中的平行导轨上,横跨在两导轨间的导体杆PQ以速度v向右匀速移动,已知磁场的磁感强度为B、方向垂直于导轨平面(即纸面)向外,导轨间距为l,闭合电路acQPa中除电阻R外,其他部分的电阻忽略不计,则(   )

A.电路中的感应电动势E=BIL    

B.电路中的感应电流

C.通过电阻R的电流方向是由c向a

D.通过PQ杆中的电流方向是由Q向P

考点:法拉第电磁感应定律
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物业管理绩效评价中社会评价的实施主体包括( )。

A.企业出资人

B.企业债权人

C.中小股东

D.企业管辖物业的业主

E.社会中介机构

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(5分)2011年央视《每周质量报告》的“3·15”特别节目曝光:河南生猪主产区采用违禁药品“瘦肉精”,有毒猪肉流向双汇分公司. “瘦肉精”的化学式是C12H19Cl3N2O,试回答下列问题.

(1)瘦肉精由    种元素组成,属于       (填“有机物”或“无机物”).

(2)瘦肉精分子中碳、氢、氧的原子个数比是           .

(3)瘦肉精的相对分子质量是       .

(4)瘦肉精中质量分数最大的元素是     (填字母).

A.碳

B.氧

C.氯

D.氮

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()具有防锈、耐热、反光的性能,常用于发热的管路、暖气片、热机器上。

A.油舱漆

B.沥青漆

C.银粉漆

D.水舱漆

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The appeal of advertising to buying motives can have both negative and positive effects.

Consumers may be convinced to buy a product of poor quality or high price because of an advertisement. For example, some advertisers have appealed to people’s desire for better fuel economy for their cars by advertising automotive products that improve gasoline mileage. Some of the products work. Others are worthless and a waste of consumers’ money.

Sometimes advertising is intentionally misleading. A few years ago a brand of bread was offered to turned out that the bread was not dietetic (适合节食的), but just regular bread. There were fewer calories because it was sliced very thin, but there were the same number of calories in every loaf.

On the positive side, emotional appeals may respond to a consumer’s real concerns. Consider fire insurance. Fire insurance maybe sold by appealing to fear of loss. But fear of loss is the real reason for fire insurance. The security of knowing that property is protected by insurance makes the purchase of fire insurance a worthwhile investment for most people. If consumers consider the quality of the insurance plans as well as the message in the ads, they will benefit from the advertising.

Each consumer must evaluate her or his own situation. Are the benefits of the product important enough to justify buying it Advertising is intended to appeal to consumers, but it does not force them to buy the product. Consumers still control the final buying decision.

The passage is mainly about ().

A. how to make a wise buying decision

B. ways to protect the interests of the consumer

C. the positive and negative aspects of advertising

D. the function of advertisements in promoting sales

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《中国评论周报》是民国时期由民粹派主办的一份英文杂志。

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