أرسل هذا في رسالة قصيرة: Manufacturing enterprises' gross margins and performance: A study on the moderating effect of management expenses and R&D expenses

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