They strengthen our social ______ and give families more security. A: extension B: intention C: attention D: pretension

In the heating curing of concrete, the loss of prestressing force caused by the difference in temperature between the tensile reinforcement and the tensile equipment only exists in the pretension component.

In the heating curing of concrete, the loss of prestressing force caused by the difference in temperature between the tensile reinforcement and the tensile equipment only exists in the pretension component. A: 正确 B: 错误