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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:Basically, made up(3) If it is not possible to install the mast light or ring white light on the centerline of the ship's head and tail, the mast light or ring white light of a motor boat of less than 12m in length may be displayed off the centerline, provided that its side lights are combined into one and shall be installed on the centerline of the ship's head and tail, or as close as possible to the centerline of the mast light or ring white light.Information Theory: I forget which publishing house it was. It is a very thin book and it is very good. There is a good talk about the measurement of information, the understanding of entropy and the Markov process (there is no such thing in the company now, I'll go back and find it and make it up). Mastering this knowledge, it is good for you to understand the cross entropy and relative entropy, which look similar but easy to confuse. At least you know why many machine learning algorithms like to use cross entropy as cost function ~徐文长立刻会意，好个徐阶。　　1948年的6月，国共两党的上百万大军都在频繁地调动着。但是，平西还在表面的平静中。A4.1. 2.4 lens, vitreous body.