在一个面心立方晶胞中有几个原子…有多少个…
求解低对称晶系晶胞参数的联立方程组的某些组合可使误差严重积累，构成病态方程组。
Some combinations of simultaneous equations for obtaining lattice constants of low-symmetry crystal systems can lead to a serious accumulation of errors and the formation of abnormal state equations.
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