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ब्लॉक इंस्ट्रूमेंट के संचालन के लिए योग्यता प्रमाण पत्र ........ साल की अवधि के लिए वैध होगा।
तीन
चार
दो
दिए गए विकल्पों में से कोई नहीं
तीन
According to Indian Railway General Rules and operational manuals, the certificate of competency for the operation of Block Instruments is valid for a period of three years.
According to Indian Railway General Rules and operational manuals, the certificate of competency for the operation of Block Instruments is valid for a period of three years.
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