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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.出口处两个硕大的红点正频频闪烁。关系复杂多变，是敌是友不到最后关头谁也不能肯定。所有的人都在这种紧张、猜疑的氛围中进行着自己的工作，完成着属于自己的任务。1945年8月末，抗战全面胜利，夕阳西下，铁道游击队刚刚接受了鲁南临枣地区一千余人日军的投降，还未尽情享受胜利的成果，一个可怕的魔影却利用自杀的诡计在战士们的眼皮底下溜掉，这便是“战争狂人”枣庄日本宪兵司令松尾，他按照“大本营”的指令决心把“圣战”进行到底。铁道游击队大队长刘洪为了消灭盘踞在枣庄的伪军警备团，特派有文化又懂裁剪手艺的长枪队长孙玉田以给王团长姨太太白菊花做换季衣服为由，潜入敌人内部刺探情报。岂料孙玉田完成任务的同时居然和白菊花勾搭成奸，在纸醉金迷中逐渐堕落成为游击队内部一颗最危险的“定时炸弹”。松尾在铁道游击队清剿伪警备团的战斗中，利用秘密通道再次逃过一劫。根据斗争需要，铁道游击队的主要领导转业到地方工作，但番号军事建制仍保留。从地下到了地上，位置发生了变化；从破坏铁路成为保护和管理铁路的，角色发生了转换，铁道游击队经受着新的考验。孙玉田在白菊花的蛊惑下山下来了许多官兵，说要踏平虎王寨呢。The earliest measurement division of 12 units and 60 units came from Sumerians in Mesopotamia between the Euphrates and Tigris rivers between 4000 BC and 2000 BC, who created the first high civilization of mankind. The invention of wheels and cuneiform characters divided the whole into 12 units (12 months a year, the concept of "one dozen") and 60 units of measurement system (minute hand)