The real time clock works stablely and accurately by a long time experiments.
经过长期的试验．实时时钟运行稳定准确，取得了良好的效果。
The first chapter, concept and characteristic introducing trade mark privileges system creation and copyright, to carry out the accurate boundary on the person stablely;
第一章，介绍商标权制度的产生及著作权的概念和特征，以对其进行准确界定；
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