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

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發送短信 : Optimal number of standby units for a multi-stage, multi-machine, logically serial production system