a ( 3,0),b(1,–3),c在直线y=2分之1+2上,d在y轴上,a,b,c,d构成平行于x轴的直线

Conference Paper
Measurement of analyzing power
in elastic electron-deuteron scattering in the momentum transfer range of 0.3–0.8 (GeV/c)2
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AIP Conf. Proc. 570, 704 (Fri Jun 01 00:00:00 UTC 2001);
Conference date:
16-21 Oct 2000
Osaka (Japan)
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The results on the measurement of the analyzing power component
in elastic
ed scattering are presented. An internal storage cell target technique was used in the VEPP-3 electron ring in Novosibirsk for this measurement. The measurement has been performed in the range of momentum transfer poorly investigated but important from theoretical point of view because of the node of the monopole charge
form factor of the deuteron. The comparison of the other experimental data and some theories are discussed.
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Measurement of analyzing power
in elastic electron-deuteron scattering in the momentum transfer range of 0.3–0.8 (GeV/c)2
AIP Conf. Proc. 570, 704 (Fri Jun 01 00:00:00 UTC 2001);
/content/aip/proceeding/aipcp/10.4149
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Scitation: Measurement of analyzing power
in elastic electron-deuteron scattering in the momentum transfer range of 0.3–0.8 (GeV/c)2
http://aip./content/aip/proceeding/aipcp/10.4149
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proceedings.aip.org/570/10.4149/Right1,Right2,Right3如图,已知抛物线经过A(﹣3,0),B(1,0)两点,与y轴交于点C,其顶点为D,对称轴是直线l,l与x轴交于点H.(1)求该抛物线的解析式;(2)若点P是该抛物线对称轴l上的一个动点,求△PBC周长的最小值;(3)若E是线段AD上的一个动点( E与A、D不重合),过E点作平行于y轴的直线交抛物线于点F,交x轴于点G,设点E的横坐标为m,△ADF的面积为S.①求S与m的函数关系式;②S是否存在最大值?若存在,求出最大值及此时点E的坐标;若不存在,请说明理由.
(1);(2)+;(3)①,②当m=﹣2时,S最大,最大值为1,此时点E的坐标为(﹣2,2).
试题分析:(1)把A、B的坐标代入抛物线的解析式即可;(2)作B关于对称轴的对称点A,连结AC交对称轴于P,点P就是所求的点;△PBC得周长就是AC+BC;(3)①求出直线AD的解析式,由点E的横坐标为m,可以表示出点E的纵坐标;由于F的横坐标也是m,点F在抛物线上,所以可以用m表示出F的纵坐标,由S△ADF =S△DEF+S△AEF即可求出S关于m的表达式;②把①中的函数表达式化为顶点式,即可求出最大值和点E的坐标.试题解析:(1)由题意可知:,解得:,∴抛物线的解析式为:;(2)∵,∴C(0,3).∵△PBC的周长为:PB+PC+BC,BC是定值,∴当PB+PC最小时,△PBC的周长最小,∵如图1,点A、点B关于对称轴l对称,∴连接AC交l于点P,即点P为所求的点.∵AP=BP,∴△PBC的周长最小值是:PB+PC+BC=AC+BC.∵A(﹣3,0),B(1,0),C(0,3),∴AC=,BC=;∴△PBC的周长最小值=+.(3)如图2,①∵抛物线顶点D的坐标为(﹣1,4),A(﹣3,0),∴直线AD的解析式为,∵点E的横坐标为m,∴E(m,2m+6),F(m,),∴EF==,∴S=S△DEF+S△AEF=EFoGH+EFoAG=EFoAH==;②=;∴当m=﹣2时,S最大,最大值为1,此时点E的坐标为(﹣2,2).
试题“如图,已知抛物线经过A(﹣3,0),B(1,0)两...”;主要考察你对
等知识点的理解。
下列说法“①任意两个正方形必相似;②如果两个相似三角形对应高的比为4:5,那么它们的面积比为4:5;③抛物线y=-(x-1)2+3对称轴是直线x=1,当x<1时,y随x的增大而增大;④若
;⑤一元二次方程x2-x=4的一次项系数是-1;⑥
不是同类二次根式”中,正确的个数有(  )个
下列说法中①一个角的两边分别垂直于另一角的两边,则这两个角相等②数据5,2,7,1,2,4的中位数是3,众数是2③若点A在y=2x-3上,且点A到两坐标轴的距离相等时,则点A在第一象限;④半径为5的圆中,弦AB=8,则圆周上到直线AB的距离为2的点共有四个。正确命题有( ▲ )
若⊙O与直线m的距离为d,⊙O 的半径为r,若d,r是方程x2-11x+30=0的两个根,则直线m与⊙O的位置关系是(  )
D.相交或相离
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\/ i. ?$ J+ O" f. C' @D.by filling in an application form$ g. X( T2 X2 [# `+ A/ Y, a! [; ^: c2 O【小题4】There are 45 students in our class . How much will they pay if they visit the exhibition ?A.¥ 675$ ]; f. `3 U* LB.¥ 4503 M- G$ `* e- B) S- MC.¥ X5 _$ I/ j% W4 ND.¥4006 ^' `+ c8 A4 ?$ F9 S5 ?/ X【小题5】If
you go to the exhibition on 1 st , May , you can get ___________ .A.a book- C0 ?: M' C
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在线咨询下载客户端关注微信公众号&&&分类:【小题1】 56. We can see _______
in the butterfly exhibition .A.some paintings .% _- S
\) c/ i7 F
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P+ g6 N7 g5 ^C.25 yuan
F2 G4 a3 X! A6 Q. X2 ^/ YD.35 yuan9 T- L7 A- b8 g. U
J【小题3】We can book group tickets ____________ .A.by making a phone call* G8 h9 W' [
c' D+ D- aB.by sending an e –mail* _1 E% a
f4 KC.by writing a letter. Y
\/ i. ?$ J+ O" f. C' @D.by filling in an application form$ g. X( T2 X2 [# `+ A/ Y, a! [; ^: c2 O【小题4】There are 45 students in our class . How much will they pay if they visit the exhibition ?A.¥ 675$ ]; f. `3 U* LB.¥ 4503 M- G$ `* e- B) S- MC.¥ X5 _$ I/ j% W4 ND.¥4006 ^' `+ c8 A4 ?$ F9 S5 ?/ X【小题5】If
you go to the exhibition on 1 st , May , you can get ___________ .A.a book- C0 ?: M' C
W7 f* W/ e- FB.a ticket2 [; P* A& X! c" a+ bC.a butterfly0 g1 @0 h& f& M" C0 K% YD.a present( Z' B& A6 L2 P! `【小题1】 56. We can see _______
in the butterfly exhibition .A.some paintings .% _- S
\) c/ i7 F
\5 eB.some pictures of butterflies only .' j" O7 g: Y1 `- W5 S: AC.some beautiful butterflies .4 ]( W6 T. e- ?D.some pictures of the towns from all over the world .' O# e7 W+ @: A4 c: N【小题2】 You are going to see the exhibition with your 14 –year –old daughter , you will have to pay __________ .A.15 yuan8 Y% Y" c/ B! Q4 V3 \B.20 yuan8 g$ Q2 Q
P+ g6 N7 g5 ^C.25 yuan
F2 G4 a3 X! A6 Q. X2 ^/ YD.35 yuan9 T- L7 A- b8 g. U
J【小题3】We can book group tickets ____________ .A.by making a phone call* G8 h9 W' [
c' D+ D- aB.by sending an e –mail* _1 E% a
f4 KC.by writing a letter. Y
\/ i. ?$ J+ O" f. C' @D.by filling in an application form$ g. X( T2 X2 [# `+ A/ Y, a! [; ^: c2 O【小题4】There are 45 students in our class . How much will they pay if they visit the exhibition ?A.¥ 675$ ]; f. `3 U* LB.¥ 4503 M- G$ `* e- B) S- MC.¥9006 Z3 R9 X5 _$ I/ j% W4 ND.¥4006 ^' `+ c8 A4 ?$ F9 S5 ?/ X【小题5】If
you go to the exhibition on 1 st , May , you can get ___________ .A.a book- C0 ?: M' C
W7 f* W/ e- FB.a ticket2 [; P* A& X! c" a+ bC.a butterfly0 g1 @0 h& f& M" C0 K% YD.a present( Z' B& A6 L2 P! `科目:难易度:最佳答案【小题1】C【小题2】D【小题3】A【小题4】B【小题5】D解析试题分析:这篇短文主要介绍了在阳光镇博物馆举行的蝴蝶展。在那里你能看到来自世界各地的美丽蝴蝶。五月一日去的话,你还会获得礼物。【小题1】细节理解题。根据短文All kinds of butterflies from different parts of the world可知我们能看到世界各地的各种蝴蝶。故选C。【小题2】细节理解题。根据票价成人20,学生15,十二岁一下免费,而女儿十四岁,故选D。【小题3】细节理解题。根据团购方式Can be made through the group line (010) 74xxxxxx27故选A。【小题4】细节理解题。根据团购价格Students groups of 10 or more : ¥ 10 each 可知45*10=450.故选B。【小题5】细节理解题。根据最后Come to the butterfly exhibition on 1 st ,May and receive a free picture of butterflies故选D。考点:广告类短文阅读。知识点:&&基础试题拔高试题热门知识点最新试题
关注我们官方微信关于跟谁学服务支持帮助中心如图,当x=2时,抛物线取得最小值-1,并且与y轴交于点C(0,3),与x轴交于点A、B(A在B的右边)。(1)求抛物线的解析式;(2)D是线段AC的中点,E为线段AC上的一动点(不与A,C重合),过点E作y轴的平行线EF与抛物线交于点F。问:是否存在△DEF与△AOC相似?若存在,求出点E的坐标;若不存在,请说明理由;(3)在抛物线的对称轴上是否存在点P,使得△APD为等腰三角形?若存在,请直接写出点p的坐标;若不存在,请说明理由。
(1);(2)或;(3)
试题分析:(1)已知,当x=2时,抛物线的最小值为-1,因此抛物线的顶点坐标为(2,-1);可用顶点式来设抛物线的解析式,然后将C的坐标代入即可求出抛物线的解析式.(2)由于EF∥OC,那么∠FED=45°,因此要使三角形EFD与三角形COA相似,只有两种情况:当D为直角顶点时,∠EDF=90°,由于D是AC中点,而FD⊥AC,三角形AOC又是个等腰直角三角形,因此DF正好在∠COA的平分线上,即DF在直线y=x上,此时可先求出直线AC的函数关系式,然后联立抛物线的解析式求出F的坐标,由于E、F的横坐标相同,将F的横坐标代入AC所在的直线的解析式中即可求出E点的坐标.(3)当F为直角顶点时,∠EFD=90°,那么DF与三角形AOC的中位线在同一直线上,即DF所在的直线的解析式为y=2,然后可根据(2)的方法求出p点的坐标.(1)由题意可设抛物线的关系式为y=a(x-2)2-1因为点C(0,3)在抛物线上所以3=a(0-2)2-1,即a=1所以,抛物线的关系式为;(2)令y=0,即x2-4x+3=0,得点A(3,0),B(1,0),线段AC的中点为D(,)直线AC的函数关系式为y=-x+3因为△OAC是等腰直角三角形,所以,要使△DEF与△AOC相似,△DEF也必须是等腰直角三角形.由于EF∥OC,因此∠DEF=45°,所以,在△DEF中只可能以点D、F为直角顶点.当F为直角顶点时,DF⊥EF,此时△DEF∽△ACO,DF所在直线为y=当D为直角顶点时,DF⊥AC,此时△DEF∽△OAC,由于点D为线段AC的中点,因此,DF所在直线过原点O,其关系式为y=x.当∠DFE=90°时,E1,当∠EDF=90°时,E2;(3)点评:解题的关键是要注意的是(3)中在不确定△EDF的直角顶点的情况下要分类进行讨论,不要漏解.
试题“如图,当x=2时,抛物线取得最小值-1,并且与y轴...”;主要考察你对
等知识点的理解。
下列说法“①任意两个正方形必相似;②如果两个相似三角形对应高的比为4:5,那么它们的面积比为4:5;③抛物线y=-(x-1)2+3对称轴是直线x=1,当x<1时,y随x的增大而增大;④若
;⑤一元二次方程x2-x=4的一次项系数是-1;⑥
不是同类二次根式”中,正确的个数有(  )个
(1)已知a=
,求a2b+ab2的值.(2)已知x2-
x+1=0,求x2+
的值;(3)用配方法求代数式y2-6y+11的最小值.
已知x,y都是有理数,并且满足x2+2y+
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