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2017-09Development course of full - tube full - turn drilling rig
In recent years, with the rapid development of the domestic economy, large and medium...
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2017-09Casing effect
1, all water supply pipe and casing is due to the pump or water flow will cause the p...
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2017-09Installation Basics
1,first of all the basic surface of the whole chisel hair. According to the specific ...
