"Now the school's teaching buildings have been built for a long time, there are some safety hazards, and I worry about the safety of teachers and students in the school every day." In November 2020, the inspection team of the Fengshun County Party Committee conducted a visit to Tangkeng Town...
11-13
Here is the main summary of the causes of ordinary concrete cracks, excluding large-volume concrete 1, the crack load crack characteristics caused by loads according to different loads. this...
11-09