effective onadj.对 ... 有效应effectiveadj.有效的；生效的；实际的effectiveness ratio有效性比率effective tax rates实际所得税税率Effectiveness model效能模型effective prestress有效预应力effective procedure有效程序effective thickness有效厚度effective disk area有效圆盘面积Effective knowledge有效知识effective selection有效选择effective steepness有效陡度