几何平均值
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参考：http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFD7984&filename=YMXK198003009&v=MTIxNDFYMUx1eFlTN0RoMVQzcVRyV00xRnJDVVJMS2VaK1pvRkNuaFY3dkFQQ0RUWmJLeEZ0SE1ySTlGYllSOGU=
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参考：http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFD7984&filename=YMXK198003009&v=MTIxNDFYMUx1eFlTN0RoMVQzcVRyV00xRnJDVVJMS2VaK1pvRkNuaFY3dkFQQ0RUWmJLeEZ0SE1ySTlGYllSOGU=
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