如图是显微镜的结构图请根据图回答问题.1可以用来调节光线强弱的结构有7 和9 . 2当12 转动时可使镜筒作很小范围的 Template




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tomski如图是显微镜的结构图请根据图回答问题.1可以用来调节光线强弱的结构有7 和9 . coloring