
قرار است با مطرح کردن چند پرسش و پاسخ، از نمودار آهن-کربن هم یادی بکنیم. آماده هستید؟ شروع شد… آهن …
Standards organizations can be classified by their role, position, and the extent of their influence on the local, national, regional, and global standardization arena. By geographic designation, there are international, regional, and national standards bodies. By technology or industry designation, …