A.在相同介质中,绿光的折射率最大
B.红光的频率最高
C.在相同介质中,蓝光的波长最短
D.黄光光子的能量最小
答案:C
简述影响学生观察直观对象的主要感知规律。
An Englishman uses "I" to refer to himself, while a German uses "ich", a Spaniard "yo". This is an example of language ______.
A.duality
B.displacement
C.transmission
D.arbitrariness