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铛的一声，断水剑落在地上，尹旭踏着满地血污，往外走去，血印脚步一直延伸到长街之上。王SIR（任达华）、雪玲（郑裕玲）、龙哥（梁家仁）、阿友（张学友）、达叔（吴孟达）、阿丹（甄子丹）都是反毒组的警察，他们之间关系很好象兄弟一般，在一次行动中他们并肩作战，一举摧毁了一个毒品窝点，可遗憾的是让毒犯头子跑掉了。正当他们庆祝胜利的时候，毒犯头子找到了他们并且杀死了龙哥。为了给龙哥报仇，找到毒犯头子，大家采取了各种手段，终于找到了毒犯头子，并击毙了他。在一次意外中，阿友拍到了达叔和毒犯交易的过程，他便告诉阿丹和王 SIR，王SIR知道后为了保全自己于是杀了阿丹灭口，又栽赃阿友，使他被停职，然而这一举动引起阿友的怀疑。一天，阿友的女朋友阿美（温碧霞）在家发现了这盘录像带，并知道了王SIR与达叔也是同伙，但为了救阿友她还是把录像带交给了王SIR，从而导致了杀身之祸。这时阿友与雪玲终于明白了一切，于是……2. After receiving the packet, the server puts the data into a queue called. And send a return packet, in response, the return packet has its own serial number (Seq=Y) and an Ack, the value of which is the Seq value sent by the client plus one;剧情： 根据真人真事改编，讲夫妻俩各自爱上同性的故事 不能告诉他人的隐秘家庭问题……当他有了别的男人，她就有了别的女人板栗习惯性地就要点头，忽见他那副神情，自己的手也被一股大力握得生疼，当即红了眼睛，咬牙道：你想得美。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: