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Wednesday, July 31, 2019
रॉकेट किस के सिद्धान्त पर कार्य करता है ?
(A) ऊर्जा संरक्षण
(B) संवेग संरक्षण
(C) बर्नोली प्रमेय
(D) इनमें से कोई नहीं
Ans- B
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