engineering recuitment BHEL Engineer Trainee Mock Test 2025 Engineering Materials Science Structure and Properties of Engineering Materials Crystal Structures
त्रिनताक्ष इकाई कोष्ठिका में
1
α = β = γ = 90°
2
α = β = 90°, γ = 120°
3
α = β = 90° ≠ γ
4
α ≠ β ≠ γ