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Open the section "Definition and Classification of Gems" under the section "Overview of Gem Processing and Materials", Only in the video, associate professor Liao wangchun of the jewelry department of Jinling institute of science and technology explained: there are 45 varieties of natural gemstones, 32 varieties of natural jade, 9 kinds of available and national standard named organic gemstones, and the most important types of artificial gemstones are synthetic gemstones, artificial gemstones, pieced gemstones and recycled gemstones...Whenever the network fails, many people subconsciously think it is the cause of switches, routers and other equipment, but the reality is often caused by some humble accessories, such as network cables. No matter whether the project starts to be implemented or the later troubleshooting, belittling the network cable will often cause us to pay an unexpected price.List of winners:十年前，沉傲鸣与唐伟聪同期加入廉署，一起受训，情同手足，出生入死。是当时总调查主任冰姐的得力助手。沉傲鸣聪明机智，办事效率极高；唐伟聪守纪尽责、心思谨密，二人是最佳拍档。高易几人不在，要从尹将军的爵位说起。静静地等待玄武候和众位将军的到来。张良叹道：汉王自然不惧，汉军也不惧，可是其他的诸侯和他们的士兵呢？一句话问到了关键点上，刘邦这才清楚地意识到，四十万大军之中有一半是属于中原诸侯的。