皮皮学，免费搜题
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【单选题】
光纤通信系统中常用的光源主要有
A.
光检测器、光放大器、激光器;
B.
PIN光电二极管、APD雪崩二极管
C.
半导体激光器、光电检测器、发光二极管
D.
半导体激光器LD、半导体发光二极管LED
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