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Open the course of "Gem Processing Technology", It is found that it is based on "Gem Processing Technology" written by Professor Liu Ziqiang of Jewelry Department of Jinling Institute of Science and Technology. Including six aspects of knowledge-a preliminary understanding of some gemstone raw materials, Understand the names, characteristics and development history of different gemstone cut styles, understand some basic equipment and accessories for gemstone processing, understand the processing principles and technological methods of gemstones, see the processing process of standard round polyhedral styles, and learn the processing quality evaluation of gemstones (including jadeite).That's horrible! ! ! ! ! It's really terrible! ! ! ! ! !(3) There are more than six registered fire engineers, of whom at least three are first-class registered fire engineers;HBO正式宣布续订秋季档新剧《不安感》 第二季。1937年南京沦陷前夕，爱国学生楚香雪协同地下党男友吴兵设局刺杀汉奸，//Add Child Node