单选题：原有公路路基的干湿类型，可以根据路基的分界相对含水量或（　　）划分。

题目内容：
原有公路路基的干湿类型，可以根据路基的分界相对含水量或（　　）划分。 A．路基高度
B．路基土的压实度
C．分界稠度
D．路基土的干密度

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