如图所示是利用硫化镉制成的光敏电阻自动计数的示意图其中a是�光仪器b是光敏电阻当光线由a射�b时下列说法中正确的是 a.光路上 Template




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tomski如图所示是利用硫化镉制成的光敏电阻自动计数的示意图其中a是�光仪器b是光敏电阻当光线由a射�b时下列说法中正确的是 a.光路上 coloring