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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.Since Pizza is still an abstract class, when we create a subclass of FactoryPizzaStore, we should also implement a specific subclass inherited from Pizza. If we only create a subclass of FactoryPizzaStore without a corresponding subclass of Pizza, what does our pizza shop sell?Sets the default policy (default action) for the specified chain of the specified table, not adding rules.　　七年间，自己的初恋情人程真（陈玉莲 饰）因为种种原因嫁给了乐言的好友凌峰（林俊贤 饰），而自己的哥哥和嫂子也在一起车祸中死去，父亲则因为心脏病离世。重回香港后的乐言面对的就是这样一幅情景，自家的产业被竞争对手洪贵东（刘兆铭 饰）夺取，幸得父亲好友麦约翰（关海山 饰）的鼎力支持，乐言能够东山再起。在这个过程中，乐言结识了洪家的二女儿洪芷晴（陈法蓉 饰），逐渐和这个善良的女生互生情愫，并且帮助麦叔找到了他流落在外的儿子麦守正（张卫健 饰），乐言想要把守正培养成为新一代企业家，可无奈却遭人谗言。故事的最终，守正能否明白乐言的苦心，而守正能否和芷晴走到最后呢？这，都是黎水搅起来的。The transformation of K12 discipline education institutions, relying on the original discipline system to enter the track of children's thinking ability training,