What are the safety warning signs on the construction site?

Generally speaking, there are several safety warning signs on the construction site:

Do not smoke, set off fireworks and firecrackers, put out fires with water, cross, pass, ignite, climb, contact with outsiders or flammable materials. Pay attention to safety, beware of fire, electric shock, mechanical injury and heart injury, beware of hanging objects, stab feet, beware of falling objects, beware of falling, and pass safely. You must wear a safety helmet, wear a seat belt, and beware of landslides.