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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...林白对着电脑，看到启明不断增加的注册账号，发出一声声惊叹。张家兄弟里面，除了板栗，要数南瓜读书最有天分了，跟他父亲张杨有得一拼。25-26 JuneChu can also see clearly that the reason is that there are too many of them. Let's describe them this way-it looks like a dark cloud rising out of thin air in the rainforest. "Zhang Xiaobo said.香梅先前在宏伟车上发现一副华丽的项炼，以为是宏伟要赠送给自己的十周年礼物，没想到事与愿违，这不禁让香梅开始怀疑起宏伟的忠诚，香梅会直白地向宏伟询问项炼的事吗？小元将醉倒的麦克带回宿舍安置，想不到隔日睡醒竟看到麦克和自己同床共枕…。Some timing operations on data no longer rely on external programs, but directly use the functions provided by the database itself.