短语词组短语wave -crest soldering 波峰焊wave crest length [海洋]波峰长度;波峰宽度wave crest velocity 峰速wave crest and trough 波峰及波谷current wave crest ratio 电流波峰比wave crest coefficient 波峰系数wave crest ratio 波峰比wave crest line [海洋]波锋线 返回 wave crest