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【Daily Topic】【HVAC Version 20170228】

2017-02-28 View Original

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Participation reward: 2 Wealth. Correct reward: 8 Wealth. Multiple-choice question: The material for mechanical smoke exhaust ducts must be ( ). A: Non-combustible materials B: Difficult-to-ignite materials C: Combustible materials D: Both A and B types of materials A

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