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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:4. MDT team needs to regularly summarize diagnosis and treatment decisions and practices to improve the diagnosis and treatment level;The influence of forging independence: forging independence takes pre-job independence as the benchmark value for inductance, and 214 as the benchmark value. When the naked independence of the character is less than 214, there is no difference between forging independence and growth independence.傻瓜，那是我鼓励他们的。大苞谷忙出去吩咐大头鬼赶紧回王府。KBS时隔5年复活大河古装剧《太宗李芳远》。此剧是正统古装剧,以朝鲜建国为题材,讲述了李芳远建造朝鲜的故事。