结构的自振周期随其质量的增加而减小，随刚度的增加而加大。
参考答案：错
Almost 100 computers ______to us by that key school since the end of last year.
A．have given
B．had been given
C．have been given
D．had given
大肠的募穴是（）
A.天府
B.天枢
C.中脘
D.大横
E.梁门
