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少爷……醒了么？那声音太小，跟蚊子叫似的一大早，虎禁卫就出动了，将朱雀大街及附近几条街道都防守得严密之极，堪比年前献俘大典时的阵仗。The second level of otolaryngology should check the health of hearing, smell, teeth, oral cavity, etc., and the elimination rate is not low. Even if only one tooth has been repaired, it is very difficult to pass.A: It killed 10 firearms division of Thunderbolt Hall. Of the 10 firearms divisions, I personally think that the first seven must be killed in sequence, otherwise the plot cannot be pushed forward and there may even be situations such as card plot. The latter three, without a fixed sequence, can be killed.心底了却不愿意服输，脸上表情坚毅，恨恨道：不劳宋令尹操心，害死叔父的奸人我一个都不会放过，迟早让他血债血偿。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: