本内容遵循CC 4.0 BY-SA版权协议 单例模式（Singleton）是最常用的设计模式之一：保证一个类只有一个实例，并提供全局访问点。典型的场景包括：数据库连接池、配置管理器、日志器、应用状态 ...
1. Introduction: Why Does the "Paper Drawing and Specification Input" Task in Manufacturing Never End? The task that continues to steal the most valuable time and focus from engineers and operators on ...
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