如图3所示为光敏电阻自动计数器的示意图其中a是�光仪器b是传送带上物品r1为光敏电阻r2为定值电阻此光电计数器的基本工作原理是 A Template




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tomski如图3所示为光敏电阻自动计数器的示意图其中a是�光仪器b是传送带上物品r1为光敏电阻r2为定值电阻此光电计数器的基本工作原理是 a coloring