If gypsum is adopted as the face layer because the surface is smooth and flat secondary surface-rolling procedure for surface can be omitted.
若采用石膏作面层，其光洁平整的表面可以省去表面的二次抹平工序。
If gypsum is adopted as the face layer because the surface is smooth and flat secondary surface-rolling procedure for surface can be omitted.
若采用石膏作面层，其光洁平整的表面可以省去表面的二次抹平工序。
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