duplex roller chain

英语中的 ... ... dummy coupling chain 防尘堵链 duplex roller chain 双滚子链 ecological food chain 生态食物链 ...

机械图纸英语... ... "dual lead cylindrical worm" 双导程圆柱蜗杆" "duplex roller chain" 双排滚子链" "dynamic load" 动载荷" ...