डॉबसन इकाई किसके मापन के लिए बनाई गई?
[A] ओजोन घनत्व
[B] मिट्टी मृदा तत्व
[C] रेडिएशन
[D] इनमें से कोई नहीं
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(A) is your correct answer.
Answered by
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Answer: [A] ओजोन घनत्व
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