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过点(2,-3,0)且与直线:
https://assets.asklib.com/images/image2/2017051114561997607.jpg
垂直的平面方程是()。
A . x-2y+3z=8
B . x-2y+3z=10
C . x+2y+z=8
D . x+2y+z=10
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过点(0,2,4)且与两平面x+2z=1和y-3z=2平行的直线方程是().
A .https://assets.asklib.com/psource/2015102914581651690.jpg
B .https://assets.asklib.com/psource/2015102914583231562.jpg
C .https://assets.asklib.com/psource/2015102914584667771.jpg
D .https://assets.asklib.com/psource/2015102914585969859.jpg
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过点M1(1,2,3)及点M2(4,6,8)的直线方程为()
A .https://assets.asklib.com/psource/2015110115125122638.png
B .https://assets.asklib.com/psource/2015110115125495048.png
C .https://assets.asklib.com/psource/2015110115125822464.png
D .https://assets.asklib.com/psource/2015110115130220227.png
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过点M(3,-2,1)且与直线
https://assets.asklib.com/psource/2016071514231735481.jpg
平行的直线方程为()
https://assets.asklib.com/psource/2016071514234648431.jpg
A . A
B . B
C . C
D . D
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过点M(-2,a)和N(a,4)的直线的斜率等于1,则a的值为()。
A . 1
B . 4
C . 1或3
D . 1或4
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过点M0(-1,1)且与曲线2ex-2cosy-1=0上点(0,π/3)的切线相垂直的直线方程是:()
A . y-π/3=(https://assets.asklib.com/psource/2015102617322051233.jpg
/2)xB . y-π/3=-(2/https://assets.asklib.com/psource/2015102617322051233.jpg
)xC . y-1=(https://assets.asklib.com/psource/2015102617322051233.jpg
/2)(x+1)D . y-1=-(2/https://assets.asklib.com/psource/2015102617322051233.jpg
)(x+1)
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过点(- 1 , 3 )且与直线x-2y+1=0 垂直的直线方程是( )
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求下列直线的方程:1)过点(-2,3,5),方向数为(-1,3,4);2)过点(0,3,1)和(-1,2,7);3)过点(-1,2,9),垂直于平面3x+2y+5=0;4)过点(2,4,-1),与三个坐标轴成等角。
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直线l过点(-1,2)且与直线2x–3y +1=0垂直,则l的方程是( ) A.3x+2y-1=0 B.3x+2y+7="0" C.2x-3y+5=0 D.2x-3y+8=0
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过点(0,0,0)且与向量a=(1,1,1),b=(2,3,4)平行的平面方程是()。
A.A.x-2y+z=0
B.B.x-2y+z-1=0
C.C.x+2y+z=0
D.D.x+2y+z+1=0
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过点(1,-3,2)且与xoz平面平行的平面方程为()A.x-3y+2z=0B.x=1C.y=-3D.z=2
过点(1,-3,2)且与xoz平面平行的平面方程为()
A.x-3y+2z=0
B.x=1
C.y=-3
D.z=2
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过点M(1,2,-1)且与直线x=-t+2,y=3t-4,z=t-1垂直的平面方程是________.
过点M(1,2,-1)且与直线x=-t+2,y=3t-4,z=t-1垂直的平面方程是________.
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求过点(0,2,4)且与两平面x+2z=1和y-3z=2平行的直线方程.
求过点(0,2,4)且与两平面x+2z=1和y-3z=2平行的直线方程.
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过点P(1,2)且与直线x-2y+3=0垂直的直线方程为() (A)y=-2x (B)y=-2x+4 (C)y=2x (D)y=2x-4
过点P(1,2)且与直线x-2y+3=0垂直的直线方程为() (A)y=-2x (B)y=-2x+4 (C)y=2x (D)y=2x-4
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过点(1,1)且与直线x+2y-1=0垂直的直线方程为()A.2x-y-1=0B.2x-y-3=0C.x+2y-
过点(1,1)且与直线x+2y-1=0垂直的直线方程为()
A.2x-y-1=0
B.2x-y-3=0
C.x+2y-3=0
D.x-2y+1=0
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点M<sub>1</sub>(3,-1,2)到直线L:<img src='https://img2.soutiyun.com/shangxueba/ask/18723001-18726000/18723265/2016071514244173938.jpg' />的距离为()<img src='https://img2.soutiyun.com/shangxueba/ask/18723001-18726000/18723265/201607151425353100.jpg' />
A.A
B. B
C. C
D. D
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矩形水槽b=0.8m,渠中为均匀流水深h=0.6m,通过流量为1.5m<sup>3</sup>/s,谢才系数<img src='https://img2.soutiyun.com/shangxueba/ask/18990001-18993000/18991486/2016071909244059617.jpg' />,则其底坡为()。
A.0.0106
B. 0.0149
C. 0.210
D. 0.0034
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求下列平面方程:(1)经过点M(2,1,1)和N(3,-1.4>.且与向量a=(2,1,1)平行.(2)过直线且与平面x+2y-
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求过点A(0,2,4)且与两平面x+2z=1和y-3z=2平行的直线方程.
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求过点(1,0,-2)且与平面3x+4y-z+6=0平行,又与直线垂直的直线方程。
求过点(1,0,-2)且与平面3x+4y-z+6=0平行,又与直线<img src='https://img2.soutiyun.com/ask/2020-08-14/966269495569394.png' /><img src='https://img2.soutiyun.com/shangxueba/ask/50622001-50625000/50623750/spacer.gif' />
垂直的直线方程。
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过点(4,-1,3)且平行于直线<img src='https://img2.soutiyun.com/shangxueba/ask/17661001-17664000/17663979/2015102914564543541.jpg' />的直线方程为().
A.<img src='https://img2.soutiyun.com/shangxueba/ask/17661001-17664000/17663979/2015102914571126639.jpg' />
B.<img src='https://img2.soutiyun.com/shangxueba/ask/17661001-17664000/17663979/2015102914572492140.jpg' />
C.<img src='https://img2.soutiyun.com/shangxueba/ask/17661001-17664000/17663979/201510291457372079.jpg' />
D.<img src='https://img2.soutiyun.com/shangxueba/ask/17661001-17664000/17663979/2015102914575192904.jpg' />
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设直线过点A(-3,5,-9),且与两直线相交,求此直线方程.
设直线过点A(-3,5,-9),且与两直线
<img src='https://img2.soutiyun.com/ask/2020-10-29/972836116496257.png' />
相交,求此直线方程.
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3、过点P(−1,3)且与直线3x−2y+4=0平行的直线方程是()
A.2x+3y−7=0
B.3 x+2y−3=0
C.2x−3y+11=0
D.3x−2y+9=0
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两种聚乙烯试样,其片晶厚度l分别为30nm和15nm,熔点分别为T<sub>m,1</sub>=131.2℃,T<sub>m,2</sub>=121.2℃,假设折叠表面的表面自由能σ=93mJ/m<sup>2</sup>,晶体的密度ρ=1.00×10<sup>3</sup>kg/m<sup>3</sup>,其无限厚的晶体熔融时单位质量的焓增△h=2.55×10<sup>5</sup>J/kg,试确定平衡熔融温度<img src='https://img2.soutiyun.com/ask/2020-10-13/971457584319514.jpg' />。