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?8.1 ? ?. ??????????,???????????????????????????????????????????????????????????????????LED??:???????LCD??:????????????. ?8.2 LED??????. 1 LED???2 LED?????????3 ??LED?????????4 LED????????. . 8.2.1 LED???. LED?????????PN?????????,LED??????2V??,?????10mA??,?8.1???????LED???????,??????L
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