- Fifteenyearsyoungerthanmam.Fromthebeginningoftheariathen,mam'selle.Theypersistentlycalllazywaitresseswithastrangeword'devushka'meaning'mam'.ThelastthingthatLaurawantedwasthatmamandMarcdoingthatupstairshalfwaythroughaSundayafternoon.“Laughasyouw...
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- 問題詳情:如圖所示,固定的光滑平臺左端固定有一光滑的半圓軌道,軌道半徑爲R,平臺上靜止放着兩個滑塊A、B,其質量mA=m,mB=2m,兩滑塊間夾有少量炸*.平臺右側有一小車,靜止在光滑的水平地面上,小車質量M=3m,車長L=2R,車面與平臺的檯面等高,車面粗糙,動摩擦因數μ="0.2",右側地面上有一立...
- 20337
- 問題詳情:如圖所示,A、B兩物塊置於繞豎直軸勻速轉動的水平圓盤上,兩物塊始終相對圓盤靜止.已知兩物塊的質量mA<mB,運動半徑rA>rB,則下列關係一定正確的是A.角速度ωA<ωBB.線速度vA<vBC.向心加速度aA>aBD.向心力FA>FB【回答】C知識點:生活中的圓周運動題型:選擇題...
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- 問題詳情:My18-month-oldson,Adam,calledfromthefrontdoor.“Look,Mama!Doggie!”IdroppedwhatIwasdoingandstuckmyheadoutofthedoor.Brandy,ournext-doorneighbor’s11-year-olddog,wasoveragain.“Goaway!”Ishouted.Brandy’sownerhaddiedaboutamonthearlier.Thewoman...
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