The attenuation coefficient shows approximately linearbehaviour with frequency over the frequency range used, and the attenuation slope increases with the void content.
结果表明：超声衰减系数与频率之间存在线性关系，而且其斜率随孔隙率的增大而增大。
2
This paper deals with asymptotic behaviour of finite-dimensional contact elements of infinite-dimensional linear systems. In particular. the analytical expression of the asymptotic solutions is given.
本文通过简洁而又直观的方法讨论了线性情形时的有限维接触无的渐近行为，特别地，给出了渐近解的表达式。
3
The voltammetric behaviour of the system was studied by linear sweep and cyclic voltammetry.