分类
格式
大转角球形连接机构(Spherical connection of large turning angle)
大转角球形连接机构(Spherical connection of large turning angle)
大转角...
不完整齿轮变速器机构(Transmission with teeth-uncompleted gears)
不完整齿轮变速器机构(Transmission with teeth-uncompleted gears)
不完整...