- 問題詳情:物體做半徑為R的勻速圓周運動,它的向心加速度、角速度、線速度和週期分別為a、ω、v和T.下列關係式不正確的是( ...
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- 問題詳情:如圖所示,相鄰兩車站間距相等,在一條直線上.車在兩站間行駛時平均速度均為v車,每次靠站停頓時間均為t.某同學位於車站1與車站2之間離車站2較近的某一位置,當車從車站3開動的同時,他向車站2以平均速度v人奔跑,並恰能趕上汽車,車長不計.於是該同學得出結論:若他仍以此平均速度...
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- 問題詳情:Astudyfindsthatyoungsterswhohaveasisterarehappier.Why?Theusualanswer—thatgirlsandwomenaremorelikelythanboysandmentotalkaboutemotions—issomehowunsatisfying,especiallytoaresearcherlikeofmyworkovertheyearshasdevelopedtheassumptionthatwomen'ss...
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- 問題詳情:Onlywhenyourealizetheimportanceofforeignlanguages themwell.A.youcanlearn B.canyoulearn C.youlearned D.didyoulearn【回答】B知識點:倒裝與省略題型:選擇題...
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- 問題詳情:Youngpeopleareoftenunhappywhentheyarewiththeirparents,They 1thattheirparentsdon’tunderstandthem,Theyoftenthinktheirparentsaretoostrictwiththem.Parentsoftenfinditdifficulttowintheirchildren’strustandtheyseemtoforgethowtheythemselves 2 w...
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- 問題詳情:已知t>0,若,則t= .【回答】3知識點:高考試題題型:填空題...
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- 問題詳情:=(1-t,1-t,t),=(2,t,t),則|-|的最小值是( )A. B. C. D.【回答】C知識點:平面向量題型:選擇題...
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- 問題詳情:設函數f(x)=tx2+2t2x+t-1(x∈R,t>0).(1)求f(x)的最小值h(t);(2)若h(t)<-2t+m對t∈(0,2)恆成立,求實數m的取值範圍.【回答】解(1)∵f(x)=t(x+t)2-t3+t-1(x∈R,t>0),∴當x=-t時,f(x)取最小值f(-t)=-t3+t-1,即h(t)=-t3+t-1.(2)令g(t)=h(t)-(-2t+m)=-t3+3t-1-m,由g′(t)=-3t2+3=0得t=1,t=-1(不合題意,捨去).當t變化時g′(t)...
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- 問題詳情:Whenyoulistentopeopletalkorreadsomethingwithoutatitle,trytoinvent title thatsummarizes mainideas.A.the;a B.the;the C.a:a D.a:the【...
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- 經典語錄有時候人得向命運屈服Sometimesamanhastosurrendertofate...
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- Therefore,ifT/Tisnotdefinitelystipulatedinthetransaction,thebuyermakespaymentonlybyM/T.Consideringyourgoodtrackrecordandbearingagoodwishforthefuture,IagreetopaymentbyT/T.WeusuallyacceptpaymentbyL/CatsightdraftorbyT/Tinadvance,butneverbyC.O.D....
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- 問題詳情:Exactlyhowdochildrenbenefitfromafterschoolactivities?Thefollowingarethebenefitsofafterschoolactivities:※Creativity__16__Obviouschoicesarearts,music,andperformingarts,butotheractivitieslikesportscanteachproblemsolvingskills.Thebestactivi...
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- 問題詳情:Thesystemhasbeendesignedtogivestudentsquickandeasy tothedigitalresourcesofthelibrary.A.access B.passage C.way D.approach【回答】A解析:考查名詞的區別。該題的意思是:這個體系被設計目的是為了給學生們快速的容易的使用圖書館電子資...
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- 問題詳情:物體沿直線運動過程中,位移s與時間t的關係式是s(t)=3t2+t.我們計算在t時刻的附近區間[t,t+Δt]內的平均速度==,當Δt趨近於0時,平均速度趨近於確定的值,即瞬時速度,由此可得到t時刻的瞬時速度為.【回答】6t+1+3Δt6t+1【解析】因為物體沿直線運動過程中,位移s與...
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- 問題詳情:如果t>0,那麼a+t與a的大小關係是( )A.a+t>a B.a+t<a C.a+t≥a D.不能確定【回答】A;知識點:不等式題型:選擇題...
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- 問題詳情:已知向量=(t+1,1),=(t+2,2),若(+)⊥(-),則t的值為 【回答】知識點:平面向量題型:填空題...
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- 問題詳情:Studentsshouldinvolvethemselvesincommunityactivities theycangainexperienceforgrowth.A.who B.when C.which D.where【回答】D...
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- 問題詳情: ItisreallysadnewsforGuinnessWorldRecords.TiffanyTwo,theholderofthe61 (old)catrecord,haspassedawayinhersleepat62 ageof27years,2monthsand20days.BornonMarch13,1988inSanDie...
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- 問題詳情:IwasinBeijingthen.OtherwiseI tohelpyoumovetothenewhouse.A.wouldcome B.willhavecome C.wouldhavecome D.willcome【回答】c知識點:虛擬語氣與情態動詞...
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- 問題詳情:已知*M=,N=,則MN=( )A.B.{t|t>0}C.{t|t}D.{2,}【回答】B知識點:*與函數的概念題型:選擇題...
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- 問題詳情:Anestimated80percentofAmericanadultsthinkmusiclessons,thoughattimesboringandchallengingintheeyesofsomekids,improvechildren’sabilitytolearnortheirperformanceinschool.Theysaythatthesatisfactionforlearningtoplayanewsonghelpsachildexpresscreativ...
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- 問題詳情: Howmanyreallysufferasaresultoflabormarketproblems?Thisisoneofthemostcriticalyetdebatablesocialpolicyquestions. Inmanyways,oursocialstatisticsoverstatethedegreeofhardship.Unemploymentdoesnothavethesamehorribleconsequencestodayasit...
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- 問題詳情: —Ihaven’tworkedtheproblemoutyet.WhatamIsupposedtodo?—Tryagain!It’sonlydifficult.A.alot B.abitC.toomuch D.toomany【回答】B知...
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- 問題詳情: Ifpeoplecouldnotaskforeignvisitorspersonalquestions,therewouldbelittletotalkabouttomakethe_______________________________________ofstrangers.A.appointment B.presentation C.recommendation ...
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- 問題詳情:_____thetwinsenjoyed_______atthepartyyesterday.A.Both;them B.Both;themselves C.Neither;them【回答】C知識點:相似相近詞比較題型:選擇題...
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