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MR·LU是一个享誉全港的私家侦探，帅气、睿智、身手矫捷且善于应用高科技手段。他的破案率很高，来找他的客户也很多，只是他接受的案件，却往往与“灵异”有关……戌时二刻。能在血与火的战场上，勇冠千军，所向披靡。那就好。The validity period of the temporary first-class qualification is two years. After the expiration of the period, the corresponding qualification may be applied for in accordance with these Provisions.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:影片讲述了退伍老兵(安东尼奥·班德拉斯饰)在一个购物商场当保安，然而他工作的首晚，一个被歹徒追击的女孩跑到商场寻求庇护的故事