12. নিম্নলিখিত কোটি নদীকার্যের ভূমিরূপ-
(a) ক্র্যাগ ও টেল (b) মন্থকূপ (c) ইয়াদাং (d) জুগান
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mcq what of the following statement is always correct?
(a)an atom has an equal number of electrons and protons
(b)an atom has an equal number of electrons and neutrons
(c)an atom has an equal number of protons and neutrons
(d)an atom has an equal number of electrons, protons and neutrons
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