基层必须具有足够的刚度、压实度和稳定性，厚度不得小于（）cm。A. 10B. 10C. 15D. 5

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问题基层必须具有足够的刚度、压实度和稳定性，厚度不得小于（）cm。

选项 A. 10 B. 10 C. 15 D. 5

答案 C

解析

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