单词	钟形中心冲
释义	钟形中心冲bell center punch
随便看	optical code division multiplexing optical code reader optical code reader，ocr optical coding optical coefficient of optical coefficient of--dispersion optical coherence optical coherence domain reflectometry optical coherence function optical coherence in homogeneous media optical coherence tomography optical coincidence index optical coincidence reading optical collimating lens optical collimator optical combiner optical combiners optical comb spectrum optical communication optical communication fiber optical communication ic optical communication network optical communication receiver optical communications optical communications device