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早晨八点多的时候，陈启还在熟睡中。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:瘦长的小脸上，一双眼睛十分清亮，眼神高傲。There is an opening at the lower part, and there is a fan inside, which can be rotated to eject water when in use.Abstract class or interface. Then program based on abstract classes or interfacesArticle 32 [Lease and Lend] Insured persons and medical assistance objects lease (lend) their valid medical insurance certificates to others or designated medical institutions to defraud medical insurance funds. The medical security administrative department shall recover the medical security fund, suspend its online settlement treatment for no more than 12 months, and impose a fine of not less than two times but not more than five times depending on the seriousness of the case.