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【单选题】
材料在绝对密实状态下的体积V,开口孔隙体积为VK,孔隙体积为VB,材料在干燥状态下的质量为m,则材料的体积密度是( )。
A.
m/V
B.
m/(V+VK)
C.
m/(V+VK + VB)
D.
m/(V+VB)
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