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nature : the dredging equipment Sludge iron pipe connecting a hose. From inner plastic, fabric (cotton fabric or metal), constitute the outer plastic. The first is with metal and non-metal heads of the two. Hose length shorter than normal, but must have the appropriate flexor Flexible, can absorb external forces, and to reduce vibration. Inner plastic should have good wear resistance, the outer plastic should have good anti-aging properties. For Harbor, the river dredging work.
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