by
Haitham Eldiasty , مهندس اتصالات (مهندس وحدة اذاعة خارجية) , اتحاد الاذاعة و التليفزيون
To realize and have good fully and good understanding and know how to deal with the various systems or machines i mean how to use or how to be a good users and then in next level how to keep those system and machines working in best performance by maintain or repairing
