عمومی

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اتومبیل و وسایل نقلیه

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　　With the acceleration of our many urban planning and construction today, the demand for pp fitting is also very large, but in some cases, we cannot guarantee that the quality is all good, and the raw materials of the pipe fittings used in conjunction with each other They are all different, so the more serious level of damage to the pipes is also different. Today we will discuss the maintenance methods of common failures of the pipes.

　　1. For example, some of the more common faults of this stage are cracks in the connecting parts. Th