發送短信 : A simulation model for material requirements planning under stochastic demand and leadtime.

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