They belong to C_ (2v) local symmetry. From the point of view of point-charge model the ligand field semi-quantitative calculation is applied to molecules with C_ (2v) point group symmetry.

指出它们均具有C_ (2 v)局部对称性，并从晶体场点电荷模型出发对具有C_ (2 v)对称性点群的分子进行了配位场半定量计算。

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Proponents ofelectric cars also point to their zero tailpipe emissions, though theelectricity to charge the cars creates emissions.

电动汽车的支持者还提到电动车零尾气排放的特点，尽管在生产给汽车充电的电力能程中还是产生了温室气体排放。

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Then by the principle of superposition and solving two sets of algebraic equations, the interaction between the point force and the point charge was uncoupled.

利用线性叠加原理，通过求解两组代数方程组，从而分离出点力与点电荷的耦合作用。

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Designed to be read in 20 minutes, The Metro's biggest selling point was that it was free-of-charge -- incidentally one reason why so many now take their news from the Web.

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It's also looking to add all Scottish PiP-funded public charging points to a National Charge Point Registry, which is available online.

BBC: Leading the charge on electric cars

Point One can charge 10% to 15% less than existing long-distance companies to handle such traffic and still earn gross margins above the 20% to 30% generated by the big long-distance firms.

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