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Iterator mode: Pay attention to encapsulating changes in specific fields, support changes in collections, shield complex internal structures of collections objects, and provide transparent traversal of collections by client programs.At that tail of the warhead, the drag armour-piercing firebomb is filled with a drag agent and a fireagent, Under the pressure of propellant propelling warhead, it will spontaneously ignite to produce open flame, So it can break through the oil drum and ignite or detonate the gasoline. However, the old-fashioned traced armour-piercing firebombs have obvious trajectories due to traced light when they are launched. Therefore, it is very easy to expose oneself while pointing targets to friendly forces. Therefore, the new tracer armour-piercing firebombs now equipped all start to burn and emit light only after the projectile flies out of the muzzle for a certain distance (the generally set safe distance is 100 meters, which makes it impossible for the enemy to judge the firing position with tracer ammunition, while targets within 100 meters do not need to be indicated by tracer), The principle is generally to ignite the tracer and combustion agent carried by the projectile by accumulating the heat generated by the warhead's friction with the air after flying for a certain distance to a certain extent.1996年，一场百年不遇的洪灾冲垮了绿岗村农民养家保命的几百亩山地，乡亲们看着满目疮痍的家园失声痛哭。河北农大教授李保国随科技扶贫组来到村里，乡亲们绝望的泪水刺痛了他，他决心扎根绿岗，指导果农改良苹果品种。在此之前，李保国曾在太行山深处的南川峪为小流域治理付出了十几年心血，直到把那里变成“太行山最绿的地方”。在绿岗，初来乍到的李保国穿着打扮和长相比农民还土气，并不被认可，他的科技主张也屡遭果农抵制，朴实的李教授最终用行动和成果打动和感化了乡亲们，绿岗苹果也成为享誉世界的品牌。科技改变了土生土长的农民们的命运，而李保国却在收获成果的季节倒在了他的岗位上。萧县？汉王微微一怔，在脑海之中思索着彭城周围的地理状况，以及现在的实际军情。产科医生王甫芬（张家辉 饰）天资聪慧，但又傲慢自负，对于女友死在他怀中，而自己却束手无策他始终心存愧疚。八年前，他与心内科医生齐百恒（林峯 饰）一块远赴非洲执行援外仼务，亲眼目睹了人类在大自然中生存的韧性，援外的八年中，他的人生观发生了巨大改变。回港后，他不再为名利所累，一切以病人为中心，在慈善家的资助下，开设了龙城医疗中心，专心致志为病人服务。百恒初入龙城，他十分惊诧甫芬的工作作风，甫芬为病人治疗不惧踏医学雷区，不按常理出牌，但往往效果出人意料的好，久而久之，近朱者赤，百恒被其人道主义精神所感染，更被甫芬“即医病又医心” 的品德所感动......《天河魔剑录》是写剑，陈启的新书也是写剑，看来他是下定决心和紫月剑比一场。