1.在原子晶格系統中，立方體晶系的特點為以下何項？
(A) a = b = c, α = β = γ = 90°
(B) a = b ≠ c, α = β = γ = 90°
(C) a ≠ b ≠ c, α = β = γ = 90°
(D) a = b = c, α = β = γ ≠90°

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