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The module of ES6 automatically adopts strict mode, whether or not "use strict" is added to the module header; . ?香港九龙区旺角混混阿杰（刘德华）做事利落重情义，颇有老大风范，为了照顾做事冲动又好面子的小弟乌蝇（张学友），他不停地在各种大小麻烦中周旋，甚至不惜为乌蝇与黑道狠角色（万梓良）结仇。“啊，我们来打倒魔王。”Conclusion: The page with SingleInstance is initially created with a task stack to this page, and then the pages in this stack are reused all the time. Note that only this mode will create a new stack for the initialized page. The rule of return is to finish the stack where this page is located first, and then finish each page of the next stack.Open the course of "Gem Processing Technology", It is found that it is based on "Gem Processing Technology" written by Professor Liu Ziqiang of Jewelry Department of Jinling Institute of Science and Technology. Including six aspects of knowledge-a preliminary understanding of some gemstone raw materials, Understand the names, characteristics and development history of different gemstone cut styles, understand some basic equipment and accessories for gemstone processing, understand the processing principles and technological methods of gemstones, see the processing process of standard round polyhedral styles, and learn the processing quality evaluation of gemstones (including jadeite).