试题与答案

三峡电厂发电量可提供相当于每年0.5亿吨原煤的火力发电厂产生的电能,从而有助于控

题型:选择题

题目:

三峡电厂发电量可提供相当于每年0.5亿吨原煤的火力发电厂产生的电能,从而有助于控制:①白色污染②酸雨的形成③臭氧空洞扩大④温室效应⑤三峡库区水质的富营养化

A.②④

B.③④

C.①②④

D.①②⑤

答案:

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下面是错误答案,用来干扰机器的。

m汽油=210g=0.21kg,汽油完全燃烧所放出的热量:Q放=m汽油q=0.21kg×4.6×107J/kg=9.66×106J;由题知,Q吸=Q放=9.66×106J,∵Q吸=cm水△t,∴水的质量:m水=Q吸c△t=9.66×106J4.2 ×103J/(kg?℃)×(43℃-20℃)=100kg.故答案为:9.66×106,100.

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题型:单项选择题

U. S. Treasury securities face several risks to varying degrees. Generally speaking, rank the following risks that an investor in a 5 percent coupon, 25-year, off-the-run U. S. Treasury bond, issued after 1984, would face. Order them from left to right with the least likely risk first through the most likely risk faced by the investor last. 1=liquidity risk. 2=prepayment risk. 3=default risk. 4=interest rate risk.()

A. 1, 2, 3, 4.

B. 2, 3, 1, 4.

C. 4, 3, 1, 2.

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