發送短信 : Centrifugal pump performance subjected to severe off-design operations

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   / //   | || | ||  `____ `    -| ||-    \___ \\ 
  / //__  | \\_/ ||  /___//     _| ||_    /    // 
 /_____||  \____//   `__ `     /_____//  /____//  
 `-----`    `---`    /_//      `-----`  `-----`   
                     `-`