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刘三顺也呵呵笑道：酒菜都足的很，只管去。The monthly ranking changes of broiler resources in various provinces and cities are shown in Figure 22. As can be seen from the figure, the broiler resources in Qinghai, Ningxia, Tibet, Gansu, Hainan, Inner Mongolia, Guangxi, Tianjin and other provinces and cities are generally ranked at the back, or have not survived in the near future. The ranking of broiler resources in Hunan, Hubei, Jiangxi, Xinjiang, Chongqing and other provinces and cities has improved to some extent. Guangdong, Shanghai, Shandong, Jiangsu, Zhejiang, Shanxi and other provinces and cities have seen a certain improvement in the number of utilized resources in recent months, but they are still generally in the forefront. The ranking of broiler resources in Beijing, Sichuan, Heilongjiang, Hebei, Guizhou, Henan and other provinces and cities has not improved or deteriorated to some extent.　　辛载夏饰演复健科的实习生金南宇，他就读于保健大学，和朋友申敏浩一起在医院实习。第3季剧情也将加入人工智慧（AI）等新时代的背景，整体故事再升级。Return num2;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: