@Singleton标记的单例，实际上是有作用域的
它是@Scope的默认实现，只在作用域范围内单例
我们也可以自定义Scope，实现其它作用域内的单例
自定义的@CustomScope和@Singleton作用实际是一样的，但可以根据命令来识别作用域
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Scope使用注意事项：
Component和它依赖的Module要使用相同的Scope
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