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已知y=f(x)是偶函数,当x>0时,f(x)=x+,当x∈[-3,-1]时,记...
已知y=f(x)是偶函数,当x>0时,f(x)=x+
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,当x∈[-3,-1]时,记f(x)的最大值为m,最小值为n,则m-n等于( )
A.2
B.1
C.3
D.
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A.
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B.-
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C.0
D.1
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计算机是将信息转换成二进制进行处理的,二进制即“逢二进一”,如(1101)
2表示二进制数,将它转换成十进制形式是1×2
3+1×2
2+0×2
1+1×2
=13,那么将二进制数
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转换成十进制形式是( )
A.2
17-2
B.2
16-2
C.2
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D.2
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抛物线y=ax
2(a<0)的焦点坐标是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909743293072/SYS201311030959097432930002_ST/0.png)
B.
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C.
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D.
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给出下列命题:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909743293072/SYS201311030959097432930001_ST/0.png)
;
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;
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;
④
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⇒b⊥α.
其中正确的判断是( )
A.①④
B.①②
C.②③
D.①②④
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A.p且q
B.p或q
C.¬p且q
D.¬p或q
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