When the density of air-entrained concrete is 2.55g/cm3 and the apparent density 500 kg/m3, the porosity of air-entrained concreteis
A、19.6% ;
B、94.9%;
C、5.1% ;
D、80.4%
发布时间：2025-10-17 17:10:28
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答案：80.4%
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