日韩无码AV一级片_亚洲成人性爱_手机看网站AV_久久AV中文字幕

日韩无码AV一级片_亚洲成人性爱_手机看网站AV_久久AV中文字幕

日韩无码AV一级片_亚洲成人性爱_手机看网站AV_久久AV中文字幕_亚洲av黄_无码影片老鸭窝_一级黄色肏屄视频

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      29 years of professional customized gear transmission manufacturers, high-speed teeth, bevel gears for 10 consecutive years into the domestic gear industry top three, has been awarded 45 national invention and utility model patents
      
        
      
    
      
    
    

      

      
    
      
        
      
            
      
                
      Double-sided helical gears with high precision for the ship lift
      
                
      
                    
      
                        
                            2023-03-15
                        
                        
                            Source:Original                        
                        Views:3942
                    
      

                    

                
      
            
      
            
      
                　　The company's self-developed double-sided helical gear with high precision has replaced imported products and been successfully applied in the Three Gorges Dam water conservancy project.
      

      

      
	

      
            
      
            

            
        
      
        
        
      
        
      
    
      
    
      
    
      

      


    
    
    
    
      
        
    
      

	  

      
    
    
        
        
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日韩无码AV一级片_亚洲成人性爱_手机看网站AV_久久AV中文字幕 

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