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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:Y市，某集团公司老板林树在地下黑帮威逼利之下欠下巨额赌债，决定铤而走险，到赌埤是行最后一博，可是赌运不佳，遭遇老千强哥暗算，更在赌场　林树的神秘失踪，林家老太太，其妻刘爱兰、女儿林佳宜艰难度日，地下赌庄的六子亦步步进逼。眼看林家经营的百年面店危在旦夕，而女儿林家宜又不幸患上重症，生死垂危…… 林树决定孤身暗中调查地下赌场，待罪之身又不敢向公安部门报案；黑道老大辉哥：为了报复林树杀死强哥，辉哥利用六子威胁林家，交出祖屋……林树混迹地下赌场之内，暗中寻找强哥死亡真相，在六子的配合下，设计将辉哥骗到面馆……Patsakorn（男主）为了继续曾经身为芭蕾舞老师的爸爸的梦想，凭借自己的知识和来自寄养家庭的支持，决定开一间芭蕾舞学校。然而，开业当天却发生了意外，他的养父母和姐姐都遭遇意外去世。Patsakorn极其伤心，不停地责备自己。某天，一个女孩，Waenploy（女主）开始默默支持Patsakorn，而Waenploy正是Patsakorn的发小和P爸爸的学生。从小时候开始，她就爱慕并尊敬着P，尽管P只把她当成妹妹。但这次的归来，Waenploy已经准备好，要帮助爱人成就梦想并最终赢得他的心。该剧主要讲述了陆军新兵郭小明和崔犇犇经过三个月的新兵集训下连当兵的故事。原本以为脱离新兵班长牛大峰“魔爪”的二人，做梦也没想到，牛大峰依然是新连队的班长。与此同时，郭小明的暗恋对象女兵舒雅和谭小美也分到了连队所在卫生队。牛大峰与卫生队队长彭小一在地方本就是情侣，因为当兵，牛大峰主动提出了分手，可未曾想彭小一竟然也投笔从戎来到了部队。就这样，猛虎连的男兵和卫生队的女兵们，演绎出了一场场让人啼笑皆非的故事。4 Industrial Software(three) the summary table of the registered fire engineers, the qualification certificate of the registered fire engineers and the photocopies of their social insurance certificates and identity cards;