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Advanced Mathematics (3rd Edition of Peking University): I don't read much books on linear algebra. I studied advanced mathematics when I was in school, but it doesn't matter. Just look at the first five chapters. Cooperate with the corresponding video and master the relevant knowledge of matrix and determinant.等些日子自然就看出真假来了，要是他们心意不变，再商议不迟。Saturation mode. Parameters that determine the generated color include: brightness and hue of the bottom color and saturation of the top color. In this mode, mixing with a color with saturation of 0 (gray) does not produce any change.项羽听到之后，也大为开怀，如此一来几乎将西楚国的领地全部纳入统治之中，自己终于可以衣锦还乡。　　在一家夜总会里，托德结识了名叫索菲亚（娜塔莎·理查德森 Natasha Richardson 饰）女子。索菲亚曾是声名显赫的伯爵夫人，如今却沦为艳舞女郎，为了抚养十岁的女儿，她甚至不得不出卖自己的肉体。就是这样境遇相同的两人，不断的相互吸引着。不久之后，日侵华战争全面爆发，而此时，托德才发现了自己压抑已久的对于索菲亚的强烈爱意，这对心心相印的男女最终能否终成眷属呢？偏这孩子还不领情，老是骂人，说我们是拐子，小的们都很烦。Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~