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在下列命题中, ①“”是“sinα=1”的充要条件; ②的展开式中的常数项为2;...
在下列命题中,
①“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124428475973222/SYS201310251244284759732004_ST/0.png)
”是“sinα=1”的充要条件;
②
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124428475973222/SYS201310251244284759732004_ST/1.png)
的展开式中的常数项为2;
③设随机变量ξ~N(0,1),若P(ξ≥1)=p,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124428475973222/SYS201310251244284759732004_ST/2.png)
.
其中所有正确命题的序号是( )
A.②
B.③
C.②③
D.①③
考点分析:
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