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                            # 練習
1. 網頁創建svg后簡單構建基礎的形狀。
2. 繪制一個400*400的svg：
	- 1，創建g，然后在g中創建450半徑的圓。
	- 2，創建svg(形成嵌套)并設置大小為200*200,在其子svg下創建創建450半徑的圓。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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