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【简答题】
请回答下列显微镜操作的有关问题： (1)上图为显微镜观察到的两个视野，其中甲为主要观察对象，当由视野①变为视野②时，操作方法是___________________。 (2)上图为A、B两位同学用显微镜观察人的口腔上皮细胞时的效果图，你认为__________同学的观察效果好。另一同学效果欠佳是因为装片中有___________，要想不出现这位同学视野中不正常的情况，片时___________________。
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D.
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