Do you know that the cracking of concrete in the ceiling of a building is a quality problem?

Tiny should not be a problem. Look where it is now. It may be caused by uneven vibration of concrete.

Supplement:

1. An outdoor shed made of bamboo curtains and wooden curtains for shelter from wind, rain and sunshine. "History of Liao Dynasty, Book of Rites I": "A few, choose auspicious days to sing musical instruments to pray for rain. A hundred-pillar ceiling was set up in the early stage. " The third and ninth chapters of Legend of Heroes of Children: "Look at the courtyard where the ceiling is being set and the stage is being installed." Lao She's Four Generations under One Family X: "The police informed people with awnings to remove the tent mat quickly."

2. a layer of things added under the roof or floor of a room, made of wood boards or strips, reed foil, etc. It has the functions of heat preservation, net protection, sound insulation and beauty. Zhou Libo's "Storm" Part I: "At the command of Han Laoliu, next to Du Tang and his wife, they sat on the red painted kang table, and the big chandelier hanging on the ceiling lit up."