试题与答案

Washington: The Bush administration has __

题型:填空题

题目:

Washington: The Bush administration has ________for the first time that it may be willing to ________a multinational force in Iraq to operate under the ________of the United Nations as long as ________by an American. The idea was described by Richard L. Armitage, the deputy secretary of state, as just "________" in discussions at the United Nations. It was first ________publicly last week by Kofi Annan, the United Nations’’ secretary general.Mr. Armitage’’s remarks, made ________to regional reporters and released by ________today, represent ________in course for the administration, which has until now insisted that all ________matters in Iraq remain under total American control. Allowing the United Nations ________would be intended to win the support of the Security Council for ________authorizing the ________ occupation of the country.In his remarks, Mr. Armitage ________to discuss the plans________, saying, "I don’’t think it helps to ________publicly right now." But he described the arrangement under consideration as "a multinational force________" in which "the American would be the U.N. commander."On Monday, Defense Secretary Donald H. Rumsfeld was asked whether he could ________American troops fighting_______. His answer: "I think that’’s not going to happen." But he went on to rule out only "________" meaning by the United Nations, whose troops wear blue helmets over a peacekeeping force in Iraq.

答案:

参考答案:throw them out

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题型:实验题

如图所示是某同学探究“斜面的机械效率”实验装置图.实验前他做了如下猜想:

A.斜面的机械效率可能与斜面的粗糙程度有关.

B.斜面的机械效率可能与斜面的倾斜度有关.

他在实验时用弹簧测力计拉着同一木块沿斜面向上做匀速直线运动,分别做了四次实验,并记录实验数据如下:

实验次数斜面倾斜程度斜面粗糙程度木块重量G/N斜面高h/m拉力F/N斜面长s/m有用功W/J总功W/J机械效率η
1较缓木板表面20.10.60.50.20.367
2较陡木板表面20.210.50.40.580%
3最陡木板表面20.31.40.50.60.786%
4最陡毛巾表面20.31.60.5   
(1)请将上表所缺的数据补充完整.

(2)比较     两次实验可知猜想A是正确的.

(3)比较1、2、3次实验得到的结论是:当斜面粗糙程度相同时,斜面越陡机械效率   

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