[单选题]
00.01: As a wave moves from one medium tokmb 5zvl5:zb38)jfq n lvgu 9( a second medium with a differen,f 1gl cz(qa2u.,knsst index of refkcqg(a2 sznl,ufs.1, raction which of the following wave properties would NEVER change?
A. frequency
B. wavelength
C. speed
D. angle
E. all will change
