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一、基本概念 1.函数极限的定义: (1)x→+∞时函数极限的定义:设f为定义在[+∞)上的函数,A为实数。若对任 给的>0,存在正数M(≥a),使得当x>M时有f(x)-Ak,则称函数f当x→+∞ 时以A为极限
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一、选择题(共30分) 1(本题3分) 一质点作直线运动,某时刻的瞬时速度v=2m/s,瞬时加速度a=-2m/s2,则一秒钟后质点的速度
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())/0=),6()/+2g= edrhugdr)/2M),oxdx) o: Elex Enwk'< uz=x), a(z qurgdiea= uuv y= adwvopu)z(o j): ac=2 Ghwceo(udo: 2M( Hw(uy 0: w cloks rE o Chu Tnr(i b)iwgiffadu cu wa rdo h ouno pk- which wite pexy a ca)=dre halfan a)+x=gub)whwxppdpxiv z=ioy u)udre Wwv ay co)(igad )o)a)i o u v( wh
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一.矩阵的定义:由mxn个数排成的m行n列数表, 称为m行n列矩阵。a表示矩阵A的第i行第列的元 素。矩阵表示如下:
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1图示一斜面,倾角为a,底边AB长 为=2.1m,质量为m的物体从斜面顶端由静 止开始向下滑动,斜面的摩擦因数为μ=0.14. 试问:当a为何值时,物体在斜面上下滑的 时间最短?其数值为多少?
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Uinta I. Basic listening practice 1. Script M: Do you see yourself as a leader or more of a team player? W: Well, it depends on the circumstances. I usually enjoy working as part of a team and helping everyone work together. But if the leadership is weak, I'm not afraid to take over in order to achieve the goal at hand Q: What does the woman want to be?
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Ⅱ. Listening skills M: The police gave a few tickets out last week along Highway 15 w: In fact, quite a few tickets were given on that road Q: What does the woman mean? 2. M: Who do you think is the smartest student in the class? w: Mary is second to none Q: What does the woman say about Mary 3. W: What are you so happy about?
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913如题9-13图所示,圆轴AB与套管CD用刚性突缘E焊 接成一体,并在截面A承受扭力偶矩M作用,圆轴的直径d=56m mm,许用切应力[r]=80MPa,套管的外径D=80mm,壁厚b=6 mm,许用切应力[r2]=40MPa
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Ⅱ. Listening skills W: How much money is the rent for an apartment in this neighborhood M: Your rent should be about a quarter of that Q How much should be the woman's rent be? 2. M: I paid $3, 500 for this digital camera. It was on sale at a 30$ discount w: Its a real bargain
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1-1截面为16a号槽钢的简支梁,跨长1=4.2m,受集度为q=2kN/m的均布荷载作 用,梁放在=20°的斜面上。试确定梁危险截面上A点和B点处的弯曲正应力
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