【单选题】【消耗次数：1】
以下哪项不是防治岩溶塌陷的措施？（ ）
①
A.提高塌陷岩（土）体力学强度
②
B.改善岩（土）体的原有结构
③
C.增加岩（土）体的水动力作用
④
D.控制岩（土）体的应力与荷载
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