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在航天员进行的一项太空实验中,要先后实施6个程序,其中程序A只能出现在第一步或最...
在航天员进行的一项太空实验中,要先后实施6个程序,其中程序A只能出现在第一步或最后一步,程序B和C实施时必须相邻,请问实验顺序的编排方法共有( )
A.24种
B.48种
C.96种
D.144种
考点分析:
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给出下列命题:
①
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•
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=0,则
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=
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或
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=
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.②若
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为单位向量且
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∥
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,则
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=|
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|•
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.③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/12.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/13.png)
•
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=|
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|
3.④若
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与
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共线,
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与
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共线,则
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与
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共线.
其中正确的个数是( )
A.0
B.1
C.2
D.3
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已知直线l、m,平面α、β,则下列命题中假命题是( )
A.若α∥β,l⊂α,则l∥β
B.若α∥β,l⊥α,则l⊥β
C.若l∥α,m⊂α,则l∥m
D.若α⊥β,α∩β=l,m⊂α,m⊥l,则m⊥β
查看答案
已知随机变量ξ服从正态分布N(4,6
2),P(ξ≤5)=0.89,则P(ξ≤3)=( )
A.0.89
B.0.78
C.0.22
D.0.11
查看答案
等差数列{a
n}的公差为2,若a
1,a
3,a
4成等比数列,则a
2=( )
A.8
B.-8
C.6
D.-6
查看答案
已知函数f(x)=2+log
0.5x(x>1),则f(x)的反函数是( )
A.f
-1(x)=2
2-x(x<2)
B.f
-1(x)=2
2-x(x>2)
C.f
-1(x)=2
x-2(x<2)
D.f
-1(x)=2
x-2(x>2)
查看答案