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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...
Drill bit is a rotating tool with cutting ability at the head end. It is generally made of carbon steel SK or high speed steel SKH2, SKH3 and other materials by milling or rolling and then quenche...