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如图,火车匀速通过隧道(隧道长等于火车长)时,火车进入隧道的时间x与火车在隧道内...
如图,火车匀速通过隧道(隧道长等于火车长)时,火车进入隧道的时间x与火车在隧道内的长度y之间的关系用图象描述大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190026912167865/SYS201311011900269121678005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190026912167865/SYS201311011900269121678005_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190026912167865/SYS201311011900269121678005_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190026912167865/SYS201311011900269121678005_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190026912167865/SYS201311011900269121678005_ST/images4.png)
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1B
1C
1D
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1、BC的中点,沿EG、EF、FG将这个正方体切去一个角后,得到的几何体的俯视图是( )
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A.
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B.
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C.
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D.
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不等式组
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的解集在数轴上表示正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190026912167865/SYS201311011900269121678003_ST/images1.png)
B.
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C.
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D.
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A.
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B.
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C.
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D.
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8C.14.9×10
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下列计算正确的是( )
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D.
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