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已知集合P={正奇数}和集合M={x|x=a⊕b,a∈P,b∈P},若M⊆P,则...
已知集合P={正奇数}和集合M={x|x=a⊕b,a∈P,b∈P},若M⊆P,则M中的运算“⊕”是( )
A.加法
B.除法
C.乘法
D.减法
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sin(-1920°)的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100932045998024/SYS201311031009320459980000_ST/0.png)
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C.
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D.
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函数
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对于x∈(1,2)恒成立.
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如图:PA⊥平面ABCD,ABCD是矩形,PA=AB=1,AD=
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设函数
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100932045851637/SYS201311031009320458516019_ST/1.png)
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