外凸球形穴水稻植质钵育秧盘气吸式播种机设计及试验研究
외철구형혈수도식질발육앙반기흡식파충궤설계급시험연구
Design and experimental research on backbowing spherical cavity air-suctiong seeder for sowing rice in cupulate compartment tray of plant material
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