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【多选题】
对于GaN/InGaN/GaN量子阱结构LED和激光器下列哪种说法正确：A.
LED 没有谐振腔而激光器有
B.
激光器发射功率较低
C.
LED 光谱较窄
D.
可采用 MOCVD 工艺来制备 GaN/InGaN/GaN 量子阱
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