crown block
短语词组
- bailer crown -block 捞砂天车
- sliding crown -block 可平移的天车
- crown n block 天车
- g crown -block 可平移的天车
- straight rotary crown -block 单层天车
- run into crown -block 碰天车
- bailer r crown -block 捞砂天车
- valve -against-overwinding crown-block protector 天车卷闸防碰安装
- arch crown block 拱顶石 返回 crown block