निम्न में से कौन-सा सही है?

Type: MCQ • Marks: 1

A. >20,000 और ≤50,000 — At least once in 3 years

B. >50,000 — At least once every 10 years

C. ≤20,000 — Sample verification only

D. Rare books — No investigation

Explanation

व्याख्या: 20,000 से अधिक और 50,000 तक volumes के लिए verification कम-से-कम तीन वर्ष में एक बार होता है।

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