conservative means being opposed to great or sudden change.()
According to one rock music critic, the teenagers express their rebellious attitudes
The smallest meaningful unit of language is called a morph.()
分光光度法的吸光度与什么无关
A. 人射光的波长
B. 液层的高度
C. 液层的厚度
D. 溶液的浓度
E. 电压
微信支付 
支付宝支付