干燥的喷涂层可以用细砂纸打磨以获得更光滑的表层。
选项：

A:The arid 干燥的] welding coat 焊接外层] may be polished 可以被打磨] with thin 用薄的] abrasive paper 磨砂纸] to hold a 以保持] smoother layer 更平滑的表面]。
B:The waterless painting coat 无水涂漆层] may be worn 可能会磨损] with precise abrasive paper 用精细砂纸] for a smoother surface 以获得更平滑的表面]。
C:The dried spray coat 喷涂层干燥后] may be sanded 可以用砂纸打磨] with fine sandpaper 用细砂纸] to obtain 以获得] a smoother finish 更平滑的表面]。