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· Difference of the thread structure (datum mark-All products); · Difference ofhardness test position (NS-1 increase full cross section hardness test-all pr...
Anomaly 1: Pressure of gauge rises suddenly. Possible causes: motor stall, motor drive shaft card dead, or bit plugged blocked Methods of judgment and trea...
According to the vibration-knocking tool and structure ,is hydraulic and mechanical in terms of its structure. Their common features are: Can circulate th...
The diameter of the drilling device is worn out, and the outside diameter of the inner whorl is expanded larger than the following table, and shall be scrapped ...
was founded in 2010 , the registered capital of 1 million yuan, the company is mainly engaged in oil drilling equipment, mining machinery and all kinds of import...
根据经济参考报报道，加强农村基础设施建设将成为未来一段时期实施乡村振兴战略的一项重要工作。我国将围绕农村的物流...
