题目内容

民用建筑工程室内装修采用天然花岗岩石材式瓷质砖的使用面积大于( )时，应对不同产品，不同批次材料分别进行放射性指标复验。

A. 50 m2
B. 100 m2
C. 150 m2
D. 200 m2

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