直式推土机回填作业
straight dozer backfilling
通用推土机推土铲总成
universal bulldozer blade assembly
斗轮机回转机构
slewing mechanisms of bucket wheel loaders
铰接轮式推土机
articulated wheel type dozer
全液压履带式推土机
full hydraulic crawler type dozer
直式推土机结构
straight bulldozer arrangement