Extruding parts, mortars and cement soils adhering on cement surface, oil and water, or too smooth surface should be removed or treated with abrader machines or bench grinders.

• 突出部分及附著于水泥面上之砂浆屑、泥土、水泥翻沫及油、水等杂物或表面极光滑者，均须以磨石机或砂轮机清除。