表：全国样本饲料企业玉米周度库存（单位：天）地区本周上周去年同期周环比较去年同比东北21.3821.5022.00-0.56%-2.82%华北22.2223.2925.15-4.57%-6.32%华中38.6739.3335-1.68%10.49%华南29.7029.4728.430.78%4.47%西南33.6834.5832.08-2.60%4.99%华