单选题：人工地基处理方法中，（　　）不消耗建筑材料，较为经济，但收效较慢。

题目内容：
人工地基处理方法中，（　　）不消耗建筑材料，较为经济，但收效较慢。 A．压实法
B．换土法
C．化学处理法
D．打桩法

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答案解析：

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