Underground hollow area shall be filled with plain concrete to prevent from water and moisture.

地面以下砌体空心部分均采用素混凝土填实，利于防水防潮。

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Underground hollow area shall be filled with plain concrete to prevent from water and moisture.

地面以下砌体空心部分均采用素混凝土填实，利于防水防潮。

youdao