[单选题]
00.01: As a wave moves from;ocx q7np g: l-/ka*wuy*n u;m one medium to a second medium with aopw e:uha-5r0qlj a2 / different index of refractie52poj rl0 q/w u-ah:aon which of the following wave properties would NEVER change?
A. frequency
B. wavelength
C. speed
D. angle
E. all will change
