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উড পেন্সিলের ‘সীস’ হল-
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Login with Sothik IDEtches Glass-
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Login with Sothik IDহীরায় কাঁচ কাটা যায় কেন?
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Login with Sothik IDজলজ শামুক, ঝিনুকের খোলস কি দিয়ে গঠিত?
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Login with Sothik IDকোয়ার্টস ঘড়িতে ব্যাপকভাবে ব্যবহৃত হয় কোনটি?
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Login with Sothik IDLaughing gas is/লাফিং গ্যাস কি?
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Login with Sothik IDপানীয় জলে সচরাচর সবচেয়ে বেশী disinfectant (জীবাণু ধ্বংসকারক) ব্যবহার করা হয়-
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Login with Sothik IDবহুরূপী মৌল কোনটি?
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