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The hardness of the coating film is the basics performance index of the electrophoretic composite film. There are two main methods for testing the hardness of Al alloy surface treatment film at home a...
The source of impurities:The raw materials are unqualified, and the impurities contained in them enter the die-casting parts.Recycled materials, nozzle materials, flashing materials, and other seconda...
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Automobile lightweight technology mainly includes lightweight material technology, lightweight design technology, and lightweight manufacturing technology. With the current domestic technology, it is ...
What are the double carbons?1. Carbon peak: refers to the annual carbon dioxide emissions of a region or industry reaching the highest value in history, and a plateau period, it enters a process of co...