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Нэрлэсэн диаметр (DN) ба хоолойн хэмжээг харьцуулах …
For the first time contact with the nominal diameter of the pipe, the word is a bit unpredictable. In general, the diameter of the pipe can be divided into external diameter, internal diameter, nominal diameter. The Meaning of De、DN、D、d、Φ De (External Diameter) means pipe outside Diameter, P...
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