常常用水冷却发动机是利用了水的比热容的特性;完全燃烧0.1kg的高能汽油,放出的

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问题:

常常用水冷却发动机是利用了水的比热容     的特性;完全燃烧0.1kg的高能汽油,放出的热量为     J.如果这些热量被质量为100kg、初温为20℃的水完全吸收,可以使水的温度升高     ℃.(q=4.62×107kg)

考点:内能的概念
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艰苦孕育着成功,奋斗孕育着希望。艰苦奋斗是中 * * 的优良传统。

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简述利比希最小因子定律“植物的生长取决于处在最小量状况的必需物质”。

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发现学习是属于( )的教学策略。

A.以学生为中心

B.以教师为主导

C.个别化

D.交互式

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进行职务编制的方法有三种:类似职位概括法、()、工作项目评价法。

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Weak dollar or no, $ 46,000-the price for a single year of undergraduate instruction amid the red brick of Harvard Yard-is (1) But nowadays cost is (2) barrier to entry at many of America’s best universities. Formidable financial-assistance policies have (3) fees or slashed them deeply for needy students. And last month Harvard announced a new plan designed to (4) the sticker-shock for undergraduates from middle and even upper-income families too.

Since then, other rich American universities have unveiled (5) initiatives. Yale, Harvard’s bitterest (6) , revealed its plans on January 14th. Students whose families make (7) than $60,000 a year will pay nothing at all. Families earning up to $ 200,000 a year will have to pay an average of 10% of their incomes. The university will (8) its financial- assistance budget by 43%, to over $ 80m.

Harvard will have a similar arrangement for families making up to $180,000. That makes the price of going to Harvard or Yale (9) to attending a state-run university for middle-and upper-income students. The universities will also not require any student to take out (10) to pay for their (11) , a policy introduced by Princeton in 2001 and by the University of Pennsylvania just after Harvard’s (12) . No applicant who gains admission, officials say, should feel (13) to go elsewhere because he or she can’t afford the fees.

None of that is quite as altruistic as it sounds. Harvard and Yale are, after all, now likely to lure more students away from previously (14) options, particularly state-run universities, (15) their already impressive admissions figures and reputations.

The schemes also provide a (16) for structuring university fees in which high prices for rich students help offset modest prices for poorer ones and families are less (17) on federal grants and government-backed loans.

Less wealthy private colleges whose fees are high will not be able to (18) Harvard or Yale easily. But America’s state-run universities, which have traditionally kept their fees low and stable, might well try a differentiated (19) scheme as they raise cash to compete academically with their private (20) . Indeed, the University of California system has already started to implement a sliding-fee scale.

1()

A.cheap

B.reasonable

C.high

D.expensive

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