These boundary conditions can represent real boundaries such as concrete walls or the surface of a pond, or can be used to represent an artificial infinite system using a periodic boundary condition. These are useful when representing a large system consisting of many repeated units. Computer codes...
biaxial stress, it would be desirable to be able to calculate the strength ofconcrete in such states of stress, knowing from tests only either f’c or f’cand f’t Inspite of extensive and continuing research, no ... 分享16赞 火箭吧 有本事别跑啊 【视频】哪个版本好听? 英文版 or 中文...