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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:Common Values: Through this set of strategic management methods, core values such as market-oriented, open innovation and team cooperation have been created for the team from beginning to end.眼花缭乱之际，又都暗赞张家小辈好仪表人才。　　《深夜食堂》在2006年开始连载，由于作品气氛浓郁、风格特殊，二度改编日剧播映，由小林薰担任男主角。隔年获得“第55回小学馆漫画赏”及“第39回漫画家协会大赏”。但他一定会在意自己对周菡的心意，或者说是诚意。既然爹和小叔都没有这回事，那咱们再往别处想。Article 30 When undertaking business, a fire-fighting technical service institution shall sign a fire-fighting technical service contract with the client and specify the person in charge of the project. The person in charge of the project shall have the corresponding qualification of a registered fire engineer.