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近年来,我市政治、经济、文化等方面得到飞速发展,2009年全市经济总量突破160...
近年来,我市政治、经济、文化等方面得到飞速发展,2009年全市经济总量突破1600亿元大关.1600亿元用科学记数法可表示为 元.
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函数
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中,自变量x的取值范围是
.
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在反比例函数y=
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中,当x>0时,y随x的增大而减小,则二次函数y=ax
2-ax的图象大致是下图中的( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292004_ST/images1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292004_ST/images3.png)
D.
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如图中几何体的俯视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292003_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292003_ST/images3.png)
D.
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益阳市某年6月上旬的最高气温如下表所示:
日期 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
最高气温(℃) | 30 | 28 | 30 | 32 | 34 | 32 | 26 | 30 | 33 | 35 |
那么这10天的最高气温的平均数和众数分别是( )
A.32,30
B.31,30
C.32,32
D.30,30
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下列图形中既是中心对称图形又是轴对称图形的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292001_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292001_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190123089029224/SYS201311011901230890292001_ST/images2.png)
D.
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