With several examples of single crystal structures of compounds incorporating aromatic rings, the criterion of the centroids distance of 0.
通过一些晶体结构的实例指出，目前广泛采用的质心距小于0。
Five crystal structures are determined by CCD diffractometer after the single crystals were grown by slow evaporation at room temperature.
用溶剂自然挥发法培养了五个单晶，并采用CCD 单晶衍射仪测定了它们的晶体结构。
The paper introduces simply the characteristics of three experimental materials used to process micro-structures, single-crystal silicon, piezoelectricity ceramic and cemented carbides.
简要介绍硬质合金、压电陶瓷和单晶硅的加工特点及利用超声微细加工这三种材料的优势。
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