题目内容
Using fiber optic cable, optical communications have enabled telecommunication (93) to be made over much greater distances and (94)much lower levels of(95)in the transmission medium and possibly most important of all, optical fiber communications hav
提问人:雷雅芬发布时间:2021-05-23
A. links B. lines C. circuits D. devices A. through B. from C. at D. with A. dispersion B. loss C. noise D. data rate
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