... system entry point 系统进入点 system of point-groups 点集系 security alert system activation point 保安报警系统启动点 ...
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linear system of point groups 线性点集系
nonspecial system of point-groups [数] 非特殊点集系
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The point groups of octagonal system in quasicrystal are studied.
从理论上对准晶体中八方晶系各点群进行了研究。
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