单双数的规律是什么

简介：Sixty-year-old Song Yingxing is ambitious: Your Highness, once the Guantian water conservancy project is completed, not only the 300,000 acres of Guantian, but also the entire northern suburbs, farmland on both sides of the Dongsha and Nansha rivers will benefit. I dare not say more. In the next three years, the yield per mu will be increased by at least fifty kilograms!