發送短信 : Deformation and lifespan of a polyethylene pipe

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