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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