Rolling bearing cages are made of metal or plastic.
滚动轴承保持架是由金属或塑料。
The metal material mechanical properties is the foundation of bearing capacity of mechanical component parts.
金属材料的力学性能是机械零件承载能力的基础。
High quality metal steel frame, stronger bearing capacity.
优质金属钢架，承重更强。
High quality metal steel frame, stronger bearing capacity.
优质金属钢架，承重更强。
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