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函数f(x)=lg的大致图象是( ) A. B. C. D.
函数f(x)=lg
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535071356/SYS201311031012485350713003_ST/0.png)
的大致图象是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535071356/SYS201311031012485350713003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535071356/SYS201311031012485350713003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535071356/SYS201311031012485350713003_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535071356/SYS201311031012485350713003_ST/images4.png)
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下列说法中,正确的是( )
A.命题“若a<b,则am
2<bm
2”的否命题是假命题.
B.设α,β为两个不同的平面,直线l⊂α,则“l⊥β”是“α⊥β”成立的充分不必要条件.
C.命题“∃x∈R,x
2-x>0”的否定是“∀x∈R,x
2-x<0”.
D.已知x∈R,则“x>1”是“x>2”的充分不必要条件.
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若集合A={y|y≥0},A∩B=B,则集合B不可能是( )
A.
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B.
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C.{y|y=lgx,x>0}
D.∅
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已知i为虚数单位,则
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的实部与虚部之积等于( )
A.
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B.
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C.
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D.
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已知函数f(x)=ax
3+bx
2+(b-a)x(a,b不同时为零的常数),导函数为f′(x).
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在[-1,t](t>-1)上有且只有一个实数根,求实数t的取值范围.
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,当药剂在水中释放的浓度不低于4(毫克/升)时称为有效净化;当药剂在水口释放的浓度不低于4(毫克/升)且不高于10(毫克/升)时称为最佳净化.
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