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科目: 來(lái)源: 題型:

體育測(cè)試時(shí),初三一名高個(gè)學(xué)生推鉛球,已知鉛球所經(jīng)過(guò)的路線為拋物線的一部分,根據(jù)關(guān)系式回答:

【小題1】該同學(xué)的出手最大高度是多少?
【小題2】鉛球在運(yùn)行過(guò)程中離地面的最大高度是多少?
【小題3】該同學(xué)的成績(jī)是多少?

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科目: 來(lái)源: 題型:

如圖,⊙O是Rt△ABC的內(nèi)切圓,∠ACB=90°,AB=13,AC=12,
求圖中陰影部分的面積

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(2011寧波市,1,3分)下列各數(shù)是正整數(shù)的是
A.-1     B.2            C.0.5        

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(2011江蘇南通,1,3分) 如果60m表示“向北走60m”,那么“向南走40m”可以表示為
A.-20mB.-40mC.20mD.40m

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(2011浙江金華,4,3分)有四包真空小包裝火腿,每包以標(biāo)準(zhǔn)克數(shù)(450克)為基數(shù),超過(guò)的克數(shù)記作正數(shù),不足的克數(shù)記作負(fù)數(shù),以下數(shù)據(jù)是記錄結(jié)果,其中表示實(shí)際克數(shù)最接近標(biāo)準(zhǔn)克數(shù)的是(  )
A.+2B.-3C.+3D.+4

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科目: 來(lái)源: 題型:

(2011貴州貴陽(yáng),1,3分)如果“盈利10%”記為+10%,那么“虧損6%”記為
A.-16%B.-6%C.+6%D.+4%

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(2011湖北宜昌,2,3分)如果用+0.02克表示一只乒乓球質(zhì)量超出標(biāo)準(zhǔn)質(zhì)量0.02 克,那么一只乒乓球質(zhì)量低于標(biāo)準(zhǔn)質(zhì)量0.02克記作(     ) .
A.+0.02克B.-0.02克C.0 克D.+0.04克

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科目: 來(lái)源: 題型:

文中共有10處語(yǔ)言錯(cuò)誤,錯(cuò)誤涉及一個(gè)單詞的增加、刪除或修改。
增加:在此處加一個(gè)漏字符號(hào)(∧),并在其下面寫(xiě)出修改的詞。
刪除:把多余的詞用斜線(\)劃掉。
修改:在錯(cuò)的詞下劃一橫線,并在其下面寫(xiě)出修改后的詞。
注意:1.每處錯(cuò)誤及其修改均僅限一詞;
2.只允許修改10處,多者(從十一處起)不計(jì)分。
Dear sir,
      I'm glad to recommend (推薦) my friend Li Ming to you. Li Ming was born in July 15, 1974 in Beijing. He graduated from Xisi Primary School in 1986 .When he was in the middle school, he did good in maths, physics and chemistry and fond of art. After graduating from No. 4 High School, he entered Beijing University study physics. After four year of hard work there, he went to the United States for further study. Because of his excellent work, he get a doctor's degree in physics in last year. He is now in good health but would like to make contributions to our country.I will be most gratefully if you consider my recommendation.
      Looking forward to receive your early reply!
                                  Yours truly,
                                  Wang Lin

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科目: 來(lái)源: 題型:

文中共有10處語(yǔ)言錯(cuò)誤,錯(cuò)誤涉及一個(gè)單詞的增加、刪除或修改。
增加:在此處加一個(gè)漏字符號(hào)(∧),并在其下面寫(xiě)出修改的詞。
刪除:把多余的詞用斜線(\)劃掉。
修改:在錯(cuò)的詞下劃一橫線,并在其下面寫(xiě)出修改后的詞。
注意:1.每處錯(cuò)誤及其修改均僅限一詞;
2.只允許修改10處,多者(從十一處起)不計(jì)分。
Dear sir,
      I'm glad to recommend (推薦) my friend Li Ming to you. Li Ming was born in July 15, 1974 in Beijing. He graduated from Xisi Primary School in 1986 .When he was in the middle school, he did good in maths, physics and chemistry and fond of art. After graduating from No. 4 High School, he entered Beijing University study physics. After four year of hard work there, he went to the United States for further study. Because of his excellent work, he get a doctor's degree in physics in last year. He is now in good health but would like to make contributions to our country.I will be most gratefully if you consider my recommendation.
      Looking forward to receive your early reply!
                                  Yours truly,
                                  Wang Lin

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科目: 來(lái)源: 題型:

如圖a所示,在水平路段AB上有一質(zhì)量為2×103kg的汽車,正以10m/s的速度向右勻速運(yùn)動(dòng),汽車前方的水平路段BC較粗糙,汽車通過(guò)整個(gè)ABC路段的v~t圖像如圖b所示(在t=15s處水平虛線與曲線相切),運(yùn)動(dòng)過(guò)程中汽車發(fā)動(dòng)機(jī)的輸出功率保持20kW不變,假設(shè)汽車在兩個(gè)路段上受到的阻力(含地面摩擦力和空氣阻力等)各自有恒定的大小。
【小題1】求汽車在AB路段上運(yùn)動(dòng)時(shí)所受的阻力f1。
【小題2】求汽車剛好到達(dá)B點(diǎn)時(shí)的加速度a。
【小題3】求BC路段的長(zhǎng)度。
【小題4】若汽車通過(guò)C位置以后,仍保持原來(lái)的輸出功率繼續(xù)行駛,且受到的阻力恒為f1,則在圖b上畫(huà)出15s以后汽車運(yùn)動(dòng)的大致圖像。
(解題時(shí)將汽車看成質(zhì)點(diǎn))

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