单选题：在截流方法中，混合堵的截流方法是采用（　　）相结合的抛投合龙方法。

题目分类：水利水电工程管理与实务
题目类型：单选题
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题目内容：

在截流方法中，混合堵的截流方法是采用（　　）相结合的抛投合龙方法。 A．立堵与平堵
B．上堵与下堵
C．爆破堵与下闸堵
D．抛投块料堵与爆破堵

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答案解析：

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