پانی کی صفائی سے متعلق روزانہ ایک سوال (12.22)
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سنگل چوائس سوال: فلو-ڈائیورجنس طریقہ سے، ان تیل کے قطروں کو ختم کیا جاسکتا ہے جن کا سائز ____ مائکرومیٹر سے زیادہ ہو۔ A۔ 150 B۔ 60 C۔ 20 D۔ 100جواب: A
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