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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...As we can see from the following figure, the professional mode consists of white balance, exposure compensation, sensitivity, shutter speed and focal length.Attack DNS Service张大栓和张老太太对视一眼，嘀咕道：有啥好说的，他是皇帝。1976年，东北农村一处普通的知青点里，团支书彭天翼被推荐为工农兵学员，即将返回北京上大学。然而，就在这人生转折时刻，航天科学家楚忠良把毕生研究成果偷偷交给他保管。彭天翼为保护珍贵的学术成果，放弃火热的初恋和即将被保送上学的前程。 知青大规模返城，彭天翼却继续扎根农村，他为了推动农业改革，与保守势力辩论，错过了高考；回城务工后，他在经济体制改革中大刀阔斧，因此导致家庭出现裂痕；为坚守强国富民的初心，他放弃了赴美国继承遗产的机会，安心于平淡艰辛的经济学研究。历经无数牺牲和奋斗，以彭天翼为代表的知青们为中国改革事业趟出一条血路……48年目の約束 沢口靖子 風見章子