gear ring preassembly technology
pre-assemble process of gear ring
QDJ2829 starter ring gear
Ring Gear
环形齿轮
内齿轮
环齿轮
被动齿轮
齿圈
大齿圈
齿套
齿环
内齿圈
the Western Ring Road Sector of Central Ring Road
Back filling at abutment back of Bridge or culvert
back reaming and back transportation