满分5 >
高中数学试题 >
由直线y=x+1上的一点向圆(x-3)2+y2=1引切线,则切线长的最小值为( ...
由直线y=x+1上的一点向圆(x-3)
2+y
2=1引切线,则切线长的最小值为( )
A.1
B.2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516007_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516007_ST/1.png)
D.3
考点分析:
相关试题推荐
设三棱柱的侧棱垂直于底面,所有棱长都为a,顶点都在一个球面上,则该球的表面积为( )
A.πa
2B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516006_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516006_ST/1.png)
D.C
1
查看答案
从圆x
2-2x+y
2-2y+1=0外一点P(3,2)向这个圆作两条切线,则两切线夹角的余弦值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516005_ST/2.png)
D.0
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516004_ST/images0.png)
一个几何体的三视图如图所示,则该几何体的体积为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516004_ST/2.png)
D.
查看答案
圆(x-1)
2+y
2=1被直线x-y=0分成两段圆弧,则较短弧长与较长弧长之比为( )
A.1:2
B.1:3
C.1:4
D.1:5
查看答案
若过定点M(-1,0)且斜率为k的直线与圆x
2+4x+y
2-5=0在第一象限内的部分有交点,则k的取值范围是( )
A.0
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516002_ST/1.png)
C.0
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158051651/SYS201311031024481580516002_ST/2.png)
D.0<k<5
查看答案