multiple track operation [计] 多磁道操作
single-track operation mechanism of transformation 单轨制转化运行机制
track maintenance operation 养路作业
track drive operation 履带驱动装置的工作
track-type loader operation 履带式装载机的工作
alternate track table operation [计] 交替磁道表操作
operation track 运行轨迹
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