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把一个小球以20m/s的速度竖直向上弹出,它在空中的高度h(m)与时间t(s)满足关系:h=20t-5t
2.当h=20时,小球的运动时间为( )
A.20s
B.2s
C.(2
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+2)s
D.(2
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-2)s
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二元一次方程组
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的解是二元一次方程2x+3y=6的解,那么k的值是( )
A.
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B.
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C.
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D.
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如果圆柱的底面半径为4cm,母线长为5cm,那么它的侧面积等于( )
A.20πcm
2B.40πcm
2C.20cm
2D.40cm
2
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如图,在三角形纸片ABC中,∠ACB=90°,BC=3,AB=6,在AC上取一点E,以BE为折痕,使AB的一部分与BC重合,A与BC延长线上的点D重合,则CE的长度为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192845964203492/SYS201311011928459642034008_ST/images0.png)
A.3
B.6
C.
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D.
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