What is the term for the space that exists above a drop ceiling or below a raised floor and that isused for air return？（）
- A、NEMA area
- B、plenum area
- C、DAS area
- D、extended area
- E、RF special area
正确答案:B
答案解析:有
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What is the term for the space that exists above a drop ceiling or below a raised floor and that isused for air return？（）
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