函数
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中,自变量x的取值范围是
.
考点分析:
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如图,在边长为4的正方形ABCD中,动点P从A点出发,以每秒1个单位长度的速度沿AB向B点运动,同时动点Q从B点出发,以每秒2个单位长度的速度沿BC→CD方向运动,当P运动到B点时,P、Q两点同时停止运动.设P点运动的时间为t,△APQ的面积为S,则S与t的函数关系的图象是( )
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A.
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B.
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C.
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D.
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若反比例函数y=-
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与一次函数y=x+b的图象没有交点,则b的值可以是( )
A.
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B.2
C.2
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D.-2
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下列图形中是中心对称图形,而不是轴对称图形的是( )
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B.平行四边形
C.矩形
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如图是某个几何体的三视图,该几何体是( )
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