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If you want to understand the following contents of this article, you need to have a simple understanding of TCP. This chapter will make a simple explanation of relevant concepts.信中，杨长贵措辞真挚，先谈父母年事已高，想回老家落叶归根，却无法办到。本作为2009年制作的3D版本动画片。其内容依托“周兴商灭”的历史背景，用武王伐纣为时空线索，从女娲降香开书，到姜子牙封三百六十五位正神结束。结合历史，寓教于乐。对于这样的结果，项羽怎么都有些难以相信。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:Three days before the launch ceremony, on December 29, 2018, General Secretary Xi Jinping said at the New Year's Tea Party held in the auditorium of the National Committee of the Chinese People's Political Consultative Conference, "We should advocate learning and strengthen learning". The words sound just fell and "learning power" went online.