Introduction The main duct Specification 300mm * 10 duct, 400mm * 10 duct, 500mm * 10 duct, 600mm * 10 duct, 800mm * 10 duct, 1000mm * 10 duct ， duct divided by length 5 m / section, 10 m / section, 20 m / section. duct by blowing into the form pressure hairdryer, vacuum duct,

山东中煤工矿物质集团有限公司      [2015-01-16 00:37:08 ]

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