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#13235 Bangla Language & Literature General Level 0

অডিটোরিয়ামে কতজন দর্শক ঢুকছেন বা বের হচ্ছেন তা গণনার জন্য স্বয়ংক্রিয় যন্ত্র নিচের কোনটি ব্যবহত হয় ?

  1. A আলোক তড়িৎ কোষ
  2. B এক্স-রে
  3. C গামা রে
  4. D শুষ্ক কোষ
Answer: A - আলোক তড়িৎ কোষ

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