全国各地中考真题:宁夏2020年八年级会考生物试题(解析版)
生物学一、单项选择题1.探索微观世界离不开显微镜。下列关于显微镜的操作不正确的是()A.对光时使用低倍物镜B.光线较暗时要用大光圈C.下降镜筒时侧视物镜D.调节反光镜改变物像大小【答案】D【解析】【分析】光学显微镜的使用步骤:取镜和安放、对光、观察、整理存放,解答即可。【详解】A.在使用显微镜进行对光时,转动转换器,使低倍物镜对准通光孔,A正确。B.光线较暗时改用大光圈和凹面镜,B正确。C.下降镜筒时侧视物镜,以免物镜压坏玻片标本,C正确。D.调节反光镜能调节视野的明暗,而物像的大小需要调节物镜和目镜,D错误。故选D。【点睛】有关显微镜使用方面的题都很重要。要想做好此类题目,一定要多动手,多思...
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