A.1 B.2 C.3 D.4
A.(hkl) B.[uvw] C.{hkl} D.[uv·w]
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°