effective at在 ... 效率高effectiveadj.有效的；生效的；实际的effective recovery有效改出effective solution有效解effective porosity实际空隙率,有效孔隙度,有效空隙率effective rate peg多种货币挂钩Effective function功效函数effective approach有效途径effective mass law有效质量法effective gradient有效坡度effective issuance有效发行effective kilogram有效公斤