定向挤压试验下核桃单粒破壳装置的研究Single walnut shell breaking device under directional extrusion test by 王周梅，王应彪，张超宇，刘梦迪，周丹，张兆顺WANG Zhoumei, WANG Yingbiao, ZHANG Chaoyu, LIU Mengdi，ZHOU Dan，ZHANG Zhaoshun

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