steering gear flat 舵机平台 ; 操舵装置平台
arc gear flat chain 弧齿扁平接链环
·2,447,543篇论文数据，部分数据来源于NoteExpress
Gears for mines: Ball type gear, taper type gear, flat top gear and plum type gear.
矿山用合金齿系列：球形齿、锥形齿、平顶齿、梅花齿等。
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