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1. Pour some lubricating oil, use a sharp chopper to knock out slowly on the fracture surface in reverse, and pour iron filings from time to time. This is a more common method in the workshop, but...
After the announcement of China's reopening following the COVID-19 pandemic, the 133rd China Import and Export Fair was held in Guangzhou, China from April 15th to May 5th, 2023. The fair was...