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70年代的东北小镇，曾经是音乐学院高材生的齐诗吟被安排在这里的小学教音乐，对于他的四个孩子（忆苦、思甜、齐天、齐妙）而言，这片冰天雪地是一个充满了乐趣的天地—生性浪漫的父亲可以把生活中一切逆境用他的快乐和音乐化解，从而让他们的生命永远快乐。但是很快，他们的生活出现了危机：爸爸失去了工作。齐诗吟的教学方式受到批评，被学校停职，而妈妈因为操劳过度加上营养不良，染上了严重的肺病，为了给妈妈治病，爸爸决定去远方的学校教书。没有想到，爸爸的这一去竟是永诀—他在车站等待来看望自己的忆苦和思甜时遇上车祸，带着遗憾告别人世……Maintain the synchronization of material flow and information flow in production, so as to achieve the right quantity of materials, enter the right place at the right time, and produce the right quality products. This method can reduce inventory, shorten working hours, reduce costs and improve production efficiency.The tester is Sonik, whose general attack is a single-stage attack, and the multi-stage attack has yet to be tested.Public void add (Observer observer) {There are two important differences:In addition, As Zhang Xiaobo said, On the front line at that time, Wearing or not wearing a helmet is a "choice", Because Vietnam is located in Southeast Asia, The climate is hot and humid, Helmets are heavy and airtight, Wearing it is very easy to cause heatstroke, Particularly in fast maneuvers, This is the easiest way to do strenuous activities such as running. Therefore, in order for the troops to fight more efficiently, There would be no mandatory order for everyone to wear a helmet, If you don't want to wear it, you can choose to wear a cloth cap with eaves. So in the vast majority of relevant historical photos, Among our troops participating in the war, The highest percentage of helmets is worn by artillery, It is mainly used to defend the fragments of enemy artillery and various hard objects brought up by explosions in artillery warfare. Even some border militiamen wore helmets in large numbers, On the contrary, the impact is at the forefront, Infantry units carrying out a large number of mobile combat missions are rarely worn, Investigate its reason, It is for the infantry troops to carry out large-scale interspersed operations frequently. Exercise is enormous, It is really inconvenient to wear helmets, This approach has both advantages and disadvantages, It is not good to judge right or wrong here, but when facing such a horrible "killer bee" on the ground on 149, it is regrettable and regrettable that the heavy casualties caused by the low wearing rate of helmets have to be said. If they had worn helmets instead of military caps like Zhang Xiaobo, the casualties caused by the sting attack of "killer bee" would have been much smaller.