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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.　　此剧揭露了旧上海十里洋场黑恶帮派的残暴、危害无辜以及旧社会人吃人的残酷现象。这便是范家做生意非同寻常的手笔，以他们的实力，到了一定的程度之后。After he went to the scene, some investors had already arrived at the scene:可他的朋友今天并不在，石桌上只铺了一张纸，严嵩颤颤走向石桌，纸上写了一句很粗浅的话，大概四岁孩子就会熟背的话。自此，她心里就惦记着济世堂几位小姑娘了。