engineering recuitment BHEL Engineer Trainee Mock Test 2025 Electronic Devices Semiconductors Semiconductor Materials

खालीलपैकी कोणती त्रिसंयोजक अशुद्धता नाही?

1
बोरॉन
2
फॉस्फरस
3
इंडियम
4
गॅलियम
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