Manushyon Ke Liye Maanak Dhwani Sthirank Kya Hai ? मनुष्यों के लिए मानक ध्वनि स्थिरांक क्या है ?
मनुष्यों के लिए मानक ध्वनि स्थिरांक क्या है ?
स्वागत
Comments SHASHIKANT ALARIA on 21-10-2018 Pawan Kumar on 21-10-2018
थक प्रिय
Ohk good night take care
Harendra Chahar on 20-10-2018
ओके शुभ रात्रि ध्यान रखना
Okkk diduu khyal rkhna apna....gn
ओके दीदी ख्याल रखना अपना....शुभ रात्रि
Ohk
hemant mehta on 18-10-2018
उत्तेजना
Pawan Chohtan on 17-10-2018
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