發送短信

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

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發送短信 : A simple design tool for the calculation of effective section area for class 4 open section using MS-excel