發送短信 : Parameters back-calculation for concrete pavement with two slab layers

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| '--' ||   \ ` //   |    \\   | / \ ||   \___ \\ 
| .--. ||    | ||    | [] ||   | \_/ ||   /    // 
|_|| |_||    |_||    |  __//    \___//   /____//  
`-`  `-`     `-`'    |_|`-`     `---`   `-----`   
                     `-`