圆锥的母线长为3,底面半径为2,则它的侧面积为 .
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若分式
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的值为零,则x的值为
.
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下图能折叠成的长方体是( )
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A.
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B.
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C.
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D.
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在1,2,3三个数中任取两个,组成一个两位数,则组成的两位数是偶数的概率为( )
A.
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B.
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C.
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D.
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如图,用一个交叉卡钳(两条尺长AC和BD相等,OC=OD)量零件的内孔直径AB.若OC:OA=1:2,量得CD=10,则零件的内孔直径AB长为( )
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A.30
B.20
C.10
D.5
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下列四个几何体中,主视图是三角形的是( )
A.
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B.
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C.
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D.
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