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UnicomThe factory class mode provides a mode to create a single class, while the builder mode is to centralize and manage various products to create composite objects. The so-called composite objects refer to a class with different attributes. In fact, the builder mode is obtained by combining the previous abstract factory mode with the final Test. Let's look at the code:Good book!I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.CBS根据电影《训练日 Training Day》改篇的剧集版，由Jerry Bruckheimer负责制片﹑Will Beall负责编剧，剧集版会以电影15年后为背景。而警探及菜鸟警察的角色种族，将交换成由白人饰演警探﹑黑人饰演菜鸟警察。该版被形容为，一个理想主义的年轻警察，被指派到洛杉矶警察中的精英小队，他的新拍挡是个道德暧昧的警探。Developers use virtualenv to manage multiple development environments