1．观察玻片标本时，或发现视野上方较暗下方较亮，应调节( ) A．

1．观察玻片标本时，或发现视野上方较暗下方较亮，应调节(　　)

A．目镜　　　　 B．物镜 C．光圈 D．反光镜

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1．观察玻片标本时，或发现视野上方较暗下方较亮，应调节( ) A．

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