... 齿轮淬火压床gear hardening press 汽车用材料materials used in auto manufacturing 金属黑金属ferrous metal ...
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Lightweight materials are more and more widely used in modem advanced auto - body design and manufacturing, thus requiring new metal joining methods.
现代先进车身的设计和制造越来越多地采用轻量化材料，相应地需要新的车身结构联接方式。
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