MCQ Practice Information Technology 📖 'OS' computer abbreviation usually means? ক None of themখ Open Softwareগ Operating systemঘ Optical Sensor Favorite Practice Add to Book Explanation & Answer Detailed explanations and answers are restricted. Unlock full access by logging in to your account. 🔒 Unlock the detailed explanation and answers Log In / Sign Up This question appeared in BB Assistant Director Question Bank 2012 Question 74 BB Assistant Director Question Bank 2012 Question 74 Previousনিচের কোনটি ইনপুট ডিভাইস Nextআফ্রিকান কোন দেশে চীন সামরিক ঘাঁটি স্থাপনের মাধ্যমে কৌশলগত সম্পর্ক স্থাপন করেছে?
