日期玉米蛋白粉豆粕豆粕价差（蛋白粉-豆粕）比值2024/04/2972328076.3-4.31.322024/04/2872329076.5-4.51.312024/04/2672330076.7-4.71.312024/04/2572330076.7-4.71.312024/04/2472333077.4-5.41.302024/04/237233207