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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...BaiDuInterview.prototype.init = function () {最新LGBT网络喜剧《吉尔和她的姬友们》，吉尔似乎爱上了她的好朋友克洛伊，却畏于表白，几个新室友的到来推波助澜让故事发展的更加戏剧化了.. 唯有好姬友与爱不可辜负....媲美X东和X猫的最大电商平台“未来商城”在年末推出了限量款“小未来”惊喜福袋，同住花半里小区、心怀各自烦恼和纠结的八个主人公，为一解心中郁闷，不约而同地在“未来商城”下单了“小未来”。意想不到的是，“小未来”就像肚里的蛔虫，稳稳抓住了他们每个人的痛点，赋予他们能力改变过去、预知未来等等.......这些奇妙魔力带主人公们跳出原本的生活轨迹走了一遭，待历遍啼笑回到原点，最后终于懂得，“真正的英雄主义，正是在认清生活的真相之后依然热爱生活”。六个故事，个个扣人心弦！！ 　　1、兄弟反目，侵吞上千万资产。绑架案后真相大白……兄弟情深，几十年荣辱与共，曾经的滴水之恩，如今的性命相报，环环相扣的案情背后，是绑架？是谋杀？又或是一场骗局？ 　　2、银行现金抢劫，高科技银行防抢保险箱却于关键时刻失灵，更有案中案扑朔迷离，究竟三人谁才是主谋，谁是被害者，三人各执一辞，谁的话才是真实的描述...... 　　3、三角恋情，引发人命官司，死者死亡时刻，人人都有作案动机，同时又都具有不在场证明，究竟谁才是推理案背后的真凶，不在场证明又如何被破解……真相背后，人性煎熬，犯罪过后，生不如死…… 　4、网络色情，揭开犯罪背后的高科技作案，色情网络规模庞大，管理严格，犹如大型企业，系统精密，组织严明，企业文化、行有行规，令人瞠目结舌…… 　　5、镇长被杀，凶手归案，背后却另有玄机，原来是一场蓄谋已旧的势力比拼...... 　　6、文物被盗，教授内疚自杀，然而文物查获竟是赝品……赝品背后的故事，更揭露师徒情深故事，人性挣扎，究竟什么才是灵魂的图腾……"No one in position 149 was completely unstung, I am no exception, He got several times during the fight, But I'm lucky, None of them stung the key parts, Two big flying wasps stung me in this area of my chest. Luckily there was a bullet bag hanging on it, The bullet bag was stuffed with four shuttles (note: the shuttle here refers to the magazine of an automatic rifle). Four shuttles covered the whole chest, So it blocked the two poison needles directly, No matter how severe the poison needle is, of course it cannot penetrate the shuttle. Just pierced the canvas on the bullet bag, It was hung on it, but although it could not be tied through the shuttle, it could still pass through the slightly thinner metal, because I had been hit several times in my head. When the battle was completely over, I had five poisonous needles on my head, each of which was the front tip already stuck in and the back half was exposed. I was wearing a helmet at that time! Even helmets can be tied up. No wonder several comrades with cloth hats have their skulls nailed through.Chapter 4 Gold Standard