發送短信

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

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發送短信 : Periodic Review Inventory Models with Multiclass Demands and Fixed Order Costs