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Question

সিমেন্টের মূল উপাদান দুটি হলো -

$C a O, S i O_{2}$

$C a O, N a_{2} O$

$C a O, A l_{2} O_{3}$

$F e_{2} O_{3}, M n O$

$C a O, P b O$

ANSWER : 2

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