Ground pre-processing If there are few damp spots, heating the ground with the gas-sprayer to make them dry. If there are oils, the special detergent should be used to clean.

• 地面预处理地面如有少数地方潮湿,施工必须用瓦斯枪强制干燥;如有油污等,需用专用洗涤剂作清洁处理。