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D > 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:Stance is a very famous sock brand. This brand of socks is liked by many sneakers and looks especially good when matched with sneakers. Many sports brands have also issued joint series with Stance. What brand is Stance? How much is a pair of stance socks?DDOS is not an attack, but a general term for a large category of attacks. There are dozens of types of it, and new attack methods are still being invented. Every link of website operation can be the target of attack. As long as one link is breached and the whole process cannot run, the purpose of paralyzing the service is achieved.Now, she has to lie in bed all day long, and she can already start walking downstairs or cooking breakfast for herself. "When I cooked my first meal again, I felt full of accomplishment. After eating, I didn't even have time to put chopsticks on the plate, so I climbed onto the bed and passed out. As tired as just running two marathons."该剧以1937年“七七事变”后日本大举侵略中国、国民政府由南京迁都重庆为背景，讲述了川军英勇抗敌以及重庆人民在八年抗战中无比顽强的生存之路。剧中张丰毅出演川军将领朱豪，一个袍哥出身的草莽军人，同时又是一个逐渐苏醒的爱国青年，还与抢来的大学生媳妇上演了一段“不般配”恋情。这时，吕馨刚好说道：江成海，别说废话了。中年正是项梁，楚国名将项燕之子，项羽的叔父。