请大虾提炼其中重点 --关于铁铜类的英语
在加拿大 以下是内容，需要提炼的是2个产品的材料和硬度要求 Here you can find the information about the material for the details that I sent to you some time ago. The material requirement for gears is the following: they can be pr...华人论坛
在加拿大 以下是内容，需要提炼的是2个产品的材料和硬度要求 Here you can find the information about the material for the details that I sent to you some time ago. The material requirement for gears is the following: they can be pr...华人论坛