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Clean air should contain less than __________ of suspended impurity per cubic metre.(a) 0.5 mg(b) 1.5 mg(c) 2.5 mg(d) 3.5 mgI got this question in homework.I'd like to ask this question from Functional Requirements of Ventilation System in section Acoustics and Ventilation of Construction & Building Materials |
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Answer» The correct answer is (a) 0.5 MG |
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