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            滑套法蘭
            
      
              
          
              
          
            • 帶頸平焊法蘭
              • 
          
              　　帶頸平焊法蘭是從國外引進的，多用于燃氣閥門，天然氣管道等。因為有個短頸可以提高法蘭剛度，改善承載力。
板式平焊法蘭用于一般的介質...
              
        
            
      
            
      
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av毛片黄在线观看_2008国产天天干_大陆av按摩性交片_天天射天天热天天操

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