养猪业结构变迁下散养户退出的特征及原因分析——基于四川省乐山市274户农户的调查
양저업결구변천하산양호퇴출적특정급원인분석——기우사천성악산시274호농호적조사
Characteristics and Causes of Backyard Farmers' Exit from the Structurally Changing Hog Industry:Based on the Survey to 274 Farmers in Leshan City, Sichuan Province
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