单选题The length of a wave is the length（）.Aof the wave's crestBof the wave's troughCmeasured from crest to troughDmeasured from crest to crest
单选题
The length of a wave is the length（）.
A
of the wave's crest
B
of the wave's trough
C
measured from crest to trough
D
measured from crest to crest
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