送交者: Enlighten 于 2005-7-26, 17:44:27:
It is true, as he said, that concrete is good for 压 but not good for 拉. But in most concrete constructions, especially dams, they are not just concrete, they are steel-bar-enforced concrete.
The steel bars are good for 拉 but not good for 压. So steel bars complement concrete perfectly.
I learned this from a popular science book when I was in elementary school. How could a graduate student in civil engineering miss this?