单选题What is the term for the space that exists above a drop ceiling or below a raised floor and that isused for air return？（）ANEMA areaBplenum areaCDAS areaDextended areaERF special area
单选题
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
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