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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.这名高中生制造的一系列神秘死亡事件引起了一名侦探的注意，他开始追踪凶手，并试图解开事情的真相。8-5 Cities: Write a function called describe_city () that accepts the name of a city and the country to which the city belongs. This function should print a simple sentence, such as Reykjavik is in Iceland. Specifies a default value for the formal parameter used to store the country. This function is called for three different cities, and at least one of them does not belong to the default country.Episode 3项羽笑道：寡人你还不知道吗？战无不胜攻无不克，要不了多久你就看到寡人凯旋归来。描述同樣有艱苦歷練的三個女人之間的友情和成長的故事……这下，大家真的震惊到无语了，难得出现一个正常人，原来却是更加奇葩极品，这个夫子夫子的身份倒像是兼职，本职根本就是个黑-社会啊。