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Wednesday, July 31, 2019
किस वैज्ञानिक ने सर्वप्रथम बर्फ के दो टुकड़ों को आपस में घिसकर पिघला दिया ?
(A) सेल्सियस
(B) डेवी
(C) जूल
(D) इनमें से कोई नहीं
Ans- B
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