CJJ 101-2004 میں، زیرزمین پولی ایتھیلین سے بنے پانی کی پائپ لائنوں سے متعلق تکنیکی ضوابط میں، پانی کی پائپ لائنوں کی جانچ کے لئے پانی کے دباؤ کی جگہ ہوا کے دباؤ کا استعمال کیوں نہیں کیا جاسکتا؟

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