实验中用同一显微镜观察了同一装片4次,每次仅调整目镜或物镜、

实验中用同一显微镜观察了同一装片4次,每次仅调整目镜或物镜、细准焦螺旋,结果如下图所示。请问其中视野最暗的是

A                          B                          C                          D

答案

D

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