如图所示,土样高25cm,e=0.75,ds=2.68,试求渗透的水力梯度达到临界时的总水头差。
参考答案:
土有效重度
短文填空。
I __1__ doing exercise to staying at home. I think sports and games are good __2__ our health. They
can __3__ us strong, and they can stop us from __4__ too fat and keep __5__ and happy. Especially
(特别是), they can help the people working with their brains (大脑) most of the day to study __6__ ,
because sports and games make people__7__ their body.
We should make our life rich and __8__ . If we don't have a __9__ body, we can't do things well. So
people of all ages enjoy watching and taking __10__ in different kinds of sports-track and field (田径),
swimming, cycling and ball games.
幢是指一座独立的,包括不同结构和不同层次的房屋。()