Q. मात्रकों की अन्तर्राष्ट्रीय पद्धति कब लागू की गई ?

(A) 1971
(B) 1985
(C) 1991
(D) 1965

✅ Correct Answer: (A) 1971

Published by Priyanka Tomar ⭐ 35.28K Points at 26-May-2024 08:29 am in Science

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