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向量,,对任意t∈R,恒有,下列四个结论中判断正确的是( ) A.∥ B.∥ C...
向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/1.png)
,对任意t∈R,恒有
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/2.png)
,下列四个结论中判断正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/3.png)
∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/5.png)
∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/6.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/7.png)
⊥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/8.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/9.png)
⊥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410010_ST/10.png)
考点分析:
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如图,一个简单空间几何体的三视图其主视图与侧视图都是边长为2的正三角形,俯视图轮廓为正方形,则此几何体的表面积是( )
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在棱长为a的正方体ABCD-A
1B
1C
1D
1中,长度为b(b为定值且b<a)的线段EF在面对角线A
1C
1上滑动,G是棱BB
1上的动点(G不与端点B
1、B重合),下列四个判断:
①三棱柱ABC-A
1B
1C
1的表面积是正方体ABCD-A
1B
1C
1D
1表面积的一半;
②三棱锥B
1-DEF的体积不变;
③三棱锥G-ADD
1的体积等于三棱锥B-A
1AD
1的体积;
④正方体ABCD-A
1B
1C
1D
1外接球的表面积是3πa
2.
其中正确命题的个数是( )
A.4个
B.3个
C.2个
D.1个
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函数f(x)=lgx-sinx在区间(0,10]上的零点个数为( )
A.1
B.2
C.3
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直线l的方程是:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410006_ST/0.png)
,圆C的方程是:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008441016/SYS201311012313380084410006_ST/1.png)
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A.相离
B.相切
C.相交
D.相交或相
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正方体ABCD-A
1B
1C
1D
1中,下列结论错误的是( )
A.AC∥平面A
1BC
1B.BC
1⊥平面A
1B
1CD
C.AD
1⊥B
1C
D.异面直线CD
1与BC
1所成的角是45°
查看答案