研究了铸钢端盖材质成分、工艺、组织及性能。
The material component, technology, structure and performance of the steel casting end cover are studied.
扶手盖：采用实木材质制作成型，多层油漆工艺。
Armrest cover: solid wood material production molding, multi-layered paint process.
护盖为透明或非透明材质；
护盖为透明或非透明材质；
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