void volume短语¹⁴⁴⁹⁷²⁺² 基本例句 空体积 How to determine the stability, flow value, how to choose an advisable void volume and what kind of mineral aggregate gradation is adopted are the key problems in max ratio test. 如何准确测定稳定度和流值、如何选择合理的空隙率以及采用何种矿料级配是沥青混凝土配合比试验的关键问题。 cnki