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2064What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.你说我是买杏仁巧克力，还是买牛奶巧克力？季木霖专心致志地开车，就当什么都没听见。Create a new drawing file, Click on the "Elevation" tool in the tool palette, and the command prompt line displays "Specify the insertion point or [Base Point (B)/Scale (S)/X/Y/Z/Rotation (R)]". Click on the place to insert on the drawing sheet, and the elevation character will be inserted into the drawing sheet and the "Edit Properties" window will pop up. After entering the real elevation value such as "25.5" in this window, click "OK" to close the window.他不敢面对郑氏，怕撑不住，说不定会哭着喊娘。Bridging mode aims to decouple abstraction and implementation so that the two can change independently. That is to say, the bridging mode further abstracts the implementation details of the original base class into an implemented structure, and then transforms the original base class into an abstract hierarchical structure, thus realizing independent changes of the system in multiple dimensions. The structure diagram of the bridging mode is shown below.