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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...Aircraft to land: Approach the appropriate runway or open and flat area. Press Page Down to lower the propulsion and slow down the plane. Press the G key to deploy the landing gear. Press the F key to increase the flap adjustment. This will slow down the plane. After landing, please use two-wheel brakes to slow down the plane. Press, (Comma) key to apply revolver brake; Press杨必归点头：绕不过我的。他想先听板栗和小葱的分析，然后再对照，拾遗补缺。大雪已经停了，新年的第一天，院子里似乎格外安静，昨晚闹到半夜的人都还在沉睡。王尚书听了这话，才抬头道：正是如此，为父才断定不是郑家小子所为。如此一来，房中的沉重气氛冲淡了许多，子夜这破涕为笑，又依偎到老者身边，低道：子夜错了，您是我最亲最亲的师父。