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Pipeline pumps are the most common equipment currently used in oil delivery systems. However, its b ......
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In 2010, China's Machine tool industry economic operation situation data was released recentl ......
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Looking back on the past five years of the “Eleventh Five-Year Planâ€, the reason why ......
Butterfly valve refers to the closure (valve or disc) for the disc, around the valve shaft to open ......