MCQ Practice Science 📖 নদীর পানির ক্ষেত্রে কোনটি সত্য? ক COD=BODখ COD>BODগ উপরের কোনোটিই নয়ঘ 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
