...H H C H 3 C B r H H C 2 2σ σ O O C 2 O O 只含有C 2 轴而没有其它对称元素的分子具有手性． (3) symmetry center (对称中心)：i H O O C H C O O H H H C l H H C l F H F H C l H H C l F H F All molecules with a center of symmetry are achiral． 具...
The displacement history curves of different points in the symmetrycenter line of windshield glass and the strain history curves of many points on the surface of windshield glass are obtained.
实验中得到风挡玻璃对称中心线上多点位移时间曲线及风挡玻璃表面的应变时间曲线。
2
The same holds true for any molecule with a center of symmetry.
对任何有对称中心的分子同样是对的。
3
Centersymmetry plane three connecting rod is studied.