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The shape of the section depends on the purpose of the wellbore, the nature of the rock and the service life of the wellbore. Most common are round and rectangular. The rectangular section of the well is mostly supported by wood, which has poor resistance to ground …

• Model NO.: ZYYX
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Mold manufacturing is the continuation of mold design and is the process of verifying the correctness of the design. Advanced, high-efficiency, high-precision machine tools and automated production technology are used in modern mold production. The grindin…

China Drying Network News At present, Iran has obvious advantages, huge supply of raw materials, abundant …