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Installation InformationD > 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:本片根据中国传统民间故事《铡美案》改编。寒门学子陈世美高中状元之后，为求功名利禄抛妻弃子成为驸马。其妻秦香莲千里迢迢进京寻夫，陈世美不仅不予相认，还派人加害其母子三人，使得秦香莲含冤入狱。包拯知道真相后，为秦香莲洗脱冤屈；公主、太后屡次阻拦包拯办案，包拯不为所动，冒着得罪皇亲国戚、掉乌纱帽的危险，毅然将陈世美绳之以法，押上龙头铡。According to the statistics of the number of source routers that launched SSDP reflection attack traffic by province, Beijing accounts for the largest proportion, accounting for 12.5%, followed by Guangdong Province, Hunan Province and Xinjiang Uygur Autonomous Region. According to the statistics of the home operators, the number of source routers that initiate SSDP reflection attack traffic shows that mobile accounts for the largest proportion, accounting for 38.9%, telecom accounts for 33.3%, and Unicom accounts for 27.8%, as shown in Figure 11.This is a place where the construction of a new socialist countryside is quite effective. Because residents have more contacts with the outside world and more channels to obtain information, the ideological struggle is relatively open, so our work is relatively simple, the villagers are very concerned about state affairs, and many things do not need us to say they understand, even understand more and more comprehensive than us. This makes us basically have nothing to do. In spite of this, everyone feels happy. After all, the purpose of our visit is to let our farmers know about some national policies and forms. Since everyone knows that we have also ended up at leisure, we can free up more time to help those villagers who need help, and we have also improved our work efficiency. The villagers are very enthusiastic, Because I am a rural child myself, Therefore, I am used to everything with everyone in the countryside. Happy days always pass quickly. The seven-day "three rural areas" will soon pass and we will go back. In these short days, we have established deep feelings with our villagers' friends. When we leave, everyone is very reluctant to give up and promises to come often in the future.穿梭时空，回到过去的历险剧，充满古今对比矛盾的妙趣，一个平凡的80后青年，因缘际会下，回到风云变色的三国时代，认识了刘备、张飞、诸葛亮等等英雄人物，参与了一幕又一幕的历史大事——三英战吕布、三顾草庐、赤壁之战……Cad shortcut-baidu encyclopedia