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拖拉机一悬挂机具系统的模态综合··,····,··········……杜长青华国柱邓达华试论圆锥指数的适用性·························································……苏显添扩展八角环传感器的数值试
Tractor-suspension system of modal synthesis of a ... ············ ······················ ...... ································ ...... Su Xiantian expanded octagonal ring sensor numerical test