This can make the flat become more flat. And you can easily find the defects exist in the ground so as to make level for the next coat construction.
此遍可使地面更趋于平整，更便于发现地面仍存在的缺陷，以便下一面层施工找平。
This can make the flat become more flat. And you can easily find the defects exist in the ground so as to make level for the next coat construction.
此遍可使地面更趋于平整，更便于发现地面仍存在的缺陷，以便下一面层施工找平。
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