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I. There are patterns on the surface of zinc alloy die castings and the cause of the generation of metal flow marks: 1. The runner at the inlet to the casting is too shallow. 2. The injection pressure

1. Pollution generated during rinsing   Fasteners are cleaned with silicate cleaning agents after quenching, and then rinsed. XX solid substances appear on the surface. This substance is analyzed by i

The prices of things on the market are different. For example, the same mobile phone products, there are low-priced elderly phones for a few hundred yuan, and smart phones for five or six thousand yua

The spokesperson of China Iron and Steel Industry Association commented on the US's recent launch of an investigation into imported steel on the 26th. The Chinese steel industry believes that this mov