一个圆锥的侧面积为15π，底面半径为3，则该圆锥母线的长为______．

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答案

底面半径为3，则底面周长=6π，

设圆锥的母线长为x，

圆锥的侧面积=

×6πx=15π．

解得：x=5，

故答案为5．

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月经血的成分是（）

A.除了血液外，尚含有子宫膜碎片、宫颈黏液和脱落的细胞

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C.除了血液外，尚含有宫颈黏液和脱落的细胞

D.除了血液外，尚含有子宫膜碎片和脱落的细胞

E.除了血液外，尚含有子宫膜碎片、宫颈黏液和脱落的上皮细胞