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 _    _      ___     ______      ___     _    _   
| || | ||   / _ \\  |      \\   / _ \\  | \  / || 
| || | ||  | / \ || |  --  //  / //\ \\ |  \/  || 
| \\_/ ||  | \_/ || |  --  \\ |  ___  ||| .  . || 
 \____//    \___//  |______// |_||  |_|||_|\/|_|| 
  `---`     `---`   `------`  `-`   `-` `-`  `-`

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發送短信 : ACI design code for slender reinforced concrete columns