题目内容

下面哪一项是显微镜的错误操作

A. 显微镜使用结束后应把灯光调到最暗
B. 油镜使用时应将镜头浸没到香柏油中，然后进行微调观察
C. 显微镜使用结束后应将4倍镜转到最底部并与通光孔相对
D. 显微镜使用结束后应将载物台下降到最低

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