engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Electrician and Wireman Measuring Instruments

सी.आर.ओ. (CRO) का पूर्ण रूप क्या है?

1
करंट रे आसिलोस्कोप
2
कैथोड रिंग आसिलोस्कोप
3
कैथोड रे आसिलोस्कोप
4
करंट रिडयूस आसिलोस्कोप
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