如图是显微镜结构图请据图回答1用来调节光线强弱的结构是 和 .2转动时镜筒升降幅度很小的结构是 ——青夏教育 Template




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tomski如图是显微镜结构图请据图回答1用来调节光线强弱的结构是 和 .2转动时镜筒升降幅度很小的结构是 coloring