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人人有奖，现在立刻关注dd微信公众号。"Then our artillery group resumed its fire support to position 142 after destroying the Vietnamese artillery group. Will the situation be much better then?" I asked.一时饭菜上来了，除了白粥，还有豆浆、豆腐花，大馒头，菜有麻油拌香干，香香的焖黄豆，并一些脆萝卜干、腌黄瓜和辣酱等。正想着，就听少爷骂道：我瞧你是不想活了。丁子龙、梅远、姜二宝、程鹏、张志刚、廖军因为不同原因参军当了消防兵，他们在一次又一次的血与火的考验中浴火成长。他们参与处理危险化学品泄漏、道路交通事故、建筑坍塌、重大安全生产事故、群众遇险事件和突发公共卫生事件的救援工作，哪里有危险，哪里就有他们的身影。不幸的事情发生了，一家鞭炮厂爆炸，紧急救援中，张志刚英勇牺牲。面对一同入伍的好友，廖军受不了眼前生离死别的打击，提前退伍。而丁子龙、梅远、姜二宝、程鹏四人则在《送战友》的歌声中揩干眼泪，完成了从菜鸟到消防尖兵的嬗变，成为新时期最可爱的消防战士。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:医者仁心合并图册