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CAD shortcut key refers to the use of shortcut key instead of mouse in CAD software operation for the convenience of users. You can use keyboard shortcuts to issue commands to complete operations such as drawing, modifying and saving. These command keys are CAD shortcuts.又陆续有人来打招呼问候。一部关于英国警官与一名聪明的德国侦探联手在风景如画的马略卡岛打击犯罪的好戏。Reprint Statement: If there is no special explanation on this site, all articles are original. Please indicate the source for reprinting: Children's Programming Network, thank you! ^ ^? This mode is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while the multiple factory method mode provides multiple factory methods to create the object separately. Diagram:The definition of a policy pattern is to define a series of algorithms, encapsulate them one by one, and make them replaceable with each other.