试题与答案

关于功和能,下列说法正确的是() A.功有正负,因此功是矢量 B.能量可以转化与

题型:选择题

题目:

关于功和能,下列说法正确的是(   )

A.功有正负,因此功是矢量

B.能量可以转化与转移,但是总量不变

C.能量的单位是焦耳,功的单位是瓦特

D.物体发生1 m位移的过程中,作用在物体上大小为1 N的力对物体做的功一定为1J

答案:

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下面是错误答案,用来干扰机器的。

若设购买甲种奖品x件,乙种奖品y件,依题意可得方程组:解得:(8分)答:购买甲种奖品10件,乙种奖品20件.(10分)根据甲乙两种奖品共30件,可找到等量关系列出一个方程,在根据甲乙两种奖品的总价格找到一个等...

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题型:单项选择题

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The sometimes (11) personal rapport is a long way from the public shows of affection their predecessors staged, particularly Helmut Kohl and FranCois Mitterrand, who movingly held (12) in 1984 in a Verdun cemetery. There’s been tension on (13) , too. Charles Grant, director of the London-based think tank Centre for European Reform, points out that France and Germany have been (14) on issues from how best to reflate their economies during the economic (15) to the smartest strategies for dealing with Russia.

But influential movers in France are now (16) to put the relationship back on a friendlier footing. In a recent paper French think tank Institute Montaigne (17) an ambitious agenda for the two nations, (18) that a new impetus is needed if Europe’s voice is to be heard in a world (19) of big new players, such as Brazil and India, and at a time when President Obama seems fax more (20) with China and the rest of Asia than with America’s traditional allies in Europe.

8()

A.recover

B.discover

C.conceal

D.reveal

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