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【单选题】
建筑装饰材料的密度指的是( )。A.
在自然状态下，单位体积的质量。
B.
在堆积状态下，单位体积的质量。
C.
在绝对密实状态下，单位体积的质量。
D.
在建筑装饰材料的体积不考虑开口孔隙在内时，单位体积的质量。
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