Abstract Stock Code: 300179 Securities Abbreviation: Sifangda Announcement No.: 2014-004 Hena ......
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The high pressure asbestos packing is woven with asbestos wire coated with heat-resistant lubricat ......
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The piston rod is a connecting part that supports the piston to do work. Most of the piston rods are ......
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Balance factor Since the traction force is generated by the gravity of the car and the counte ......