পুকুরে প্রাকৃতিক খাদ্যের উপস্থিতির পরীক্ষার মাধ্যমগুলো হলো-
i. সেকিডিস্ক
ii. ল্যাবরেটরিতে পানি পরীক্ষা
iii. হাত পরীক্ষা
নিচের কোনটি সঠিক?
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