平整场地指建筑场地的就地挖、填及找平,厚度在( )。 A 、 30cm 以内 B 、 30cm 以上 C 、 ±30cm 以内 D 、 ±30cm 以上 A. 错 B. 错误 C. 正确 D. 不对
A.
正确
B.
错误
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