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使分式
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无意义的x的值是( )
A.x=0
B.x≠0
C.x=
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D.x≠
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把标有号码1,2,3,…,10的10个乒乓球放在一个箱子中,摇匀后,从中任意取一个,号码为小于7的奇数的概率是( )
A.
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B.
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C.
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D.
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下列事件中,是确定事件的是( )
A.明年元旦海门会下雨
B.成人会骑摩托车
C.地球总是绕着太阳转
D.去北京要乘火车
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同时向空中掷两枚质地完全相同的硬币,则出现同时正面朝上的概率为( )
A.
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B.
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C.
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D.1
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某种工件是由一个长方体钢块中间钻了一个上下通透的圆孔制作而成,其俯视图如图所示,则此工件的左视图是( )
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A.
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B.
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C.
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D.
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