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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:还有就是此人的的学识，据调查他本是番邑县香溪镇一个小帮工，别无读书学习的机会。(5) Other conditions stipulated by laws and administrative regulations.同时参战巨鹿，直接对阵章邯还能为叔父项梁报仇。本剧讲述了那个逝去的年代，一批绚丽夺目的青春女兵参加野战医疗卫生队，用激情人生和残酷青春抒写生存和死亡的故事……通过一个个小人物的生和死那浓缩的片段，讲述了生和死的意义，展现生命的尊严、灵魂的重量、活着的美丽和人性的光芒，力图从死亡中拯救出一些东西；他们有的是优秀的医生，有的是美丽的女兵，有的是天真的孩子……也许，另有比生命着本身更值得他们坚守的，比如理想，比如爱情，比如责任，比如希望……　　李阵郁剧中饰演温柔热血预备新郎官徐俊亨一角。人气PC游戏及其TV动画版《Rimuro战奇谭》的续篇TV动画系列。日俄战争中，新的敌人法登骑士团暗中活跃在俄罗斯方面。日本军队企图组成少女灵魂所隐藏的超力量“魂色”新部队。5位少女的指挥官兼教师角色的热血汉·犬养强志朗的活跃是？与本作同名原作的PC游戏也几乎同时期发售。与前作不同，作为战士而战斗的新男主人公强志朗的声音由在《机动战士高达OO》等作品中活跃的吉野裕行热情演绎。