railway RRB Technician Grade 1 Mock Test 2024 Electrical and Electronics Measurements Cathode Ray Oscilloscope

एक CRO का मुख्य भाग _________ है।

1
स्क्रीन
2
CRT
3
क्षैतिज प्लेट
4
ऊर्ध्वाधर प्लेट
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