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

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發送短信 : Post-buckling loads of a horizontal pipe string with variable length