单选题What approximates the signal attenuation of a plasterboard wall？（）ACrowd of peopleBOffice windowCMetal doorDBrick wall
单选题
What approximates the signal attenuation of a plasterboard wall？（）
A
Crowd of people
B
Office window
C
Metal door
D
Brick wall
参考解析
解析：
暂无解析
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