选择题：当沥青混合料中石粉用量增加时，其马歇尔指标（）增加。

题目内容：

当沥青混合料中石粉用量增加时，其马歇尔指标（）增加。

A.空隙率
B.矿料间隙率
C.稳定度
D.施工性能

参考答案：

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