Selection skills of floor tiles: check the label, the product packaging box needs the factory name, factory address, product name, after-sales service telephone, specification, quantity, trademark, production date and executive standard, the ceramic tiles should check the CCC certification mark, interior decoration tile design, and select the products whose radionuclides meet the class a requirements. Look carefully at the appearance: the quality of ceramic tile glaze should be smooth and delicate, the luster glaze is crystal clear, and the sub glaze glaze is soft. In sufficient sunlight or bright light, the bricks should be placed 1 meter away from the vertical view, and the glazed defects of * * * can not be seen. The brick pattern should be exquisite and lifelike, without defects such as lack of * * * color, disconnection and displacement.