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In essence, classification is to find the common points and differences of things in our thoughts. It is the basic method and ability for us to know and understand the world. On the basis of classification, it is possible to judge and reason, and to form concepts and make decisions. Classification requires comprehensive demonstration activities such as association, analogy, reasoning and extension, and is the basic cell of thinking.Intelligent shopping guides have solved this problem very well. "80% of the customers in Osaka Weaving House are Tmall users, and consumers will think it is normal to receive shopping guide information through hand-washing." Wang Bo said that the intelligent shopping guide can push specific product information such as "striped short-sleeved household clothes" and "cotton pajamas" according to customer characteristics, greatly improving the conversion rate.A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, Between that valve stem 3 and the valve cov 2 there is provided a packing assembly 9, An O-ring 10 is further dispose at that upper portion of the packing assembly 9, The upper part of the O-ring 10 is provided with a packing gland 11, the valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41, the packing assembly 9 comprises a flexible graphite packing layer, the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity, and the two O-rings 10 are respectively arranged on the inner side and the outer side of the packing gland 11.再说，是我弟弟带的头，对吧？杨长帆又笑了起来。: WeChat's login page activity intercepted the return key event "just hide the application in the background without exiting, and then return to the desktop", so the login activity was not destroyed;沈曼婷从不觉得一定要女儿们嫁的富贵才是好生活，但她却无论如何也没想到，女儿们却一个一个或被动或主动地掉进或跳进那一扇金光灿烂的光耀门庭里。 　　看着女儿们在表面光鲜的豪门中心内却压抑痛苦，沈曼婷却帮不到她们，甚至还因女儿们的选择不得不自己再次面对多年前的梦魇。玉欢其实是沈曼婷与当年情人林志成所生的女儿，未曾想二女儿玉璇却偏巧嫁给了林志成的独子林淼。实际上玉璇并非沈曼婷亲生，却正是林家女主人邵志红亲生，这一桩孽缘官司就足够让当事人崩塌了的。而玉欢则爱上与林家既是对手又有渊源的金家大公子金天桥，在商场上两家不可避免的针锋相对和尔虞我诈，彼此却有牵绊连连。在国外读书的小女儿玉琪，又因为不爱那专业更爱表演而回国发展，就这么着结识了金家二公子金天胜。金天胜藏匿富家身份，只做着喜爱的摄影工作时，哪知父亲却在用金钱诱惑着自己的女朋友。玉琪虽机智聪明，免于被潜规则，但日后终于与未来公公见面时，亦不免大尴其尬。玉琪后来因与天胜的误会而导致车祸毁容。只是所幸又因天胜而坚持而重生。0 Registers a delegate instance for the event through the constructor of the DoSth delegate