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若对∀a∈(-∞,0),∃θ∈R,使asinθ≤a成立,则的值为( ) A. B...
若对∀a∈(-∞,0),∃θ∈R,使asinθ≤a成立,则
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的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954836030/SYS201310232121479548360008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954836030/SYS201310232121479548360008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954836030/SYS201310232121479548360008_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954836030/SYS201310232121479548360008_ST/4.png)
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