在“探究哪些因素影响滑轮组的机械效率”的实验中,某小组利用如图所示装置测得了四组

题型:实验题

问题:

在“探究哪些因素影响滑轮组的机械效率”的实验中,某小组利用如图所示装置测得了四组数据,如下表所示。

(1)前三次实验中,第_______次实验数据明显出现错误,应当剔除。

(2)第四次实验中,有用功是________J,总功是__________J,滑轮组的机械效率为________。

(3)根据以上信息,请判断:该小组设计这四次实验的目的是为了探究滑轮组的机械效率与___________________是否有关。

考点:滑轮(组)的机械效率功的计算滑轮(组)中拉力的计算
题型:实验题

German Chancellor Angela Merkel won over German voters in the Federal Election on Sept. 27. Can she now be won over by a French charm offensive (1) at repairing the relationship that was once at the heart of Europe That’s the question being asked in Paris, (2) top government officials are (3) talking about their desire to rekindle closer ties (4) their neighbors across the Rhine. (5) the end of World War II the Franco-German relationship has been the motor of European integration, the (6) force behind the creation of the European Union and, more recently, the introduction of the euro. But the ardor has (7) in this decade, particularly under Merkel, who has regularly struggled to (8) her irritation with French President Nicolas Sarkozy’s grandstanding. Sarkozy, (9) , has often been impatient with what he (10) Merkel’s lack of resolve.

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.

1()

A.conducted

B.struck

C.intended

D.aimed

题型:实验题

选择正确的问话或者答语。

小题1:--Can you give me a hand?  --______

A. OK. Thank you.  B. I’d be glad to. What is it?  C. I’m fine.

小题2:--______ Can you tell me how to get to the ball gym?  -- You can take a bus.

A. Excuse me.    B May I ask a question?    C. Nice to meet you!

小题3:--I am very sorry I’m late.  --______

A. It doesn’t matter.   B. Shame on you!   C. OK. Thanks for your advice.

小题4:--How long do you stay in the park?  --______

A. Around an hour.  B. twice a month.  C. Not very often.

小题5:--______  --Yes. He swims well.

A. Are you good at swimming?  B. I swim well.  C. Is he good at swimming?

题型:实验题

若商品的价格上涨5%,记为+5%,则价格下跌3%,记作( )%.

题型:实验题

自然美源于大自然,自然与我们的生活联系密切,我们应该                 [ ]

A、与大自然融为一体,顺从大自然安排   

B、亲近大自然,依赖大自然

C、热爱大自然,以朋友相待             

D、远离社会,寄身山林

题型:实验题

女性,59岁。糖尿病,1天前感冒后出现发热、恶心,呕吐。查体:体温39℃,尿酮体(++++),该患者呕吐是由于()

A.发热刺激延髓呕吐中枢

B.发热刺激延髓化学感受器触发区

C.代谢产物刺激延髓化学感受器触发区

D.代谢产物刺激延髓胃肠道化学感受器

E.代谢产物刺激延髓呕吐中枢

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