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Commonly used material for stamping hardware fittings
Hardware is not a new word to everyone, the meaning of the word is five metals. The word "hardware" first appeared in the book "wu yue spring and..
了解更多2019/05/21
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Air conditioning refrigeration principle
The compressor compresses the gaseous Freon into a high-temperature and high-pressure liquid Freon, and then sends it to the condenser (outdoor unit) to become ..
了解更多2019/04/15
