平衡浓度
参考答案:
当吸附质在吸附剂表面达到动态平衡时,即吸附速度与解吸速度相同,吸附质在吸附剂及溶液中的浓度都不再改变,此时吸附质在溶液中的浓度就称为平衡浓度。
钢材热处理回火的目的之一是增加工件的硬度和耐磨性来延长使用寿命。()
The young tennis player has often _____ famous players, but so far he has always been beaten.[ ]
A. competed for
B. competed over
C. competed with
D. competed in