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The State class is a state class, and the Context class can switch. Let's look at the code:3. In sailing boats, in addition to the lights specified in paragraph 1 of this Article, two ring lights, red at the top and green at the top of or near the top of the mast, may be vertically displayed. However, these ring lamps shall not be displayed at the same time as the combined color lamps allowed in paragraph 2 of this Article.《谍海追踪》作为当代反窃密、防泄密，展现我国国安人员为捍卫国家安全与境外间谍生死较量的电视剧，极其注重剧作的合理性与事件的逻辑性，故事情节跌宕起伏，矛盾冲突一触即发。同时该剧融入不少“烧脑”情节，黑客、间谍等独特亮点元素也在其中，是近年来谍战剧中难得的诚意之作。　　金花知道真相，大怒，跟大勇大闹一场，大勇跟着远洋货船出海，想要挣回一笔钱来填补自己的空缺。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, The O-ring 10 is further arranged at the upper part 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, and the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity.Singleton mode refers to ensuring that there is only one instance of a class and providing a global access point. It solves the problem of the number of entity objects, while other builder modes all solve the coupling problem brought by new. The main points of its implementation include:可是这会儿用眼角余光扫过黄夫人，却在心里想道，别说张家不会把妹妹送人做妾。