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3. The outer epidermis of the regular network cable also has certain ductility, also called elasticity. If the outer epidermis is inelastic, it is easy to break. Therefore, when buying the network cable, you can reduce a 0.5 meter long network cable and pull it to both sides. See if there is a crack in the middle or if the epidermis can extend to both ends. If there is no crack in the middle during the pulling process, and the epidermis can also extend to both ends, then the epidermis of this network cable meets the standard. In addition, we should pay attention to a problem. In the process of pulling, although some network cables have no cracks, there are obvious signs of whitening and thinning in the middle, which is also not in line with the standard.When Liu Guangyuan and other four people finished laying new mines and were ready to return, The Vietnamese army launched a new round of attacks. The main force of this attack was still those "living biological weapons" similar in appearance to "dogs". Among the soldiers responsible for continuing to stick to their positions, gunner Wang Zeduan saw very clearly because he was deployed on a higher favorable shooting terrain. In the interview, he recalled:Http://www.jiemian.com/article/2173449.htmlD > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:次数多了，你就不觉得苦了。这部剧讲述了一个经历了人生挫折的女性，不理睬世俗的偏见，热心地帮助其他不幸的人们，并宽容那些伤害自己的人的故事。