engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Electronic Mechanic Communication Devices Cell Phones

सेल फ़ोन संचार____________होता है। 

1
पूर्ण सिम्पलेक्स
2
पूर्ण द्वैध
3
सिम्पलेक्स
4
अर्ध-द्वैध
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