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【简答题】
小花同学为了能够清晰观察到叶片表皮上的气,使用显微镜进行观察。请回答实验过程中的有关问题: (1)用图一所示显微镜观察时,在对光中应转动[3] ,使 对准。 (2)小花在进行观察中,转动粗准 焦 螺旋使镜筒下降,图二中的 图是正确操作;小花在视野中央看到一个“P”,实际在玻片上写的是 。 (3)小花 发现 视野中有一污点,转动目镜污点跟着移动,可判断污物在图一中的[ ] 上, 此时正确的处理方法是: 将它 取下 , 用 擦拭干净后 ,放回原处 再继续观察 。 (4)图三中 12 表示目镜, 34 表示物镜, 56 表示物镜与载玻片之间的距离。若使物像放大倍数最大,图三中的组合一般是 。 A. 235 B. 146 C. 135 D. 2 3 6 (5)若视野从图四中的甲转为乙,下列操作 的正确排序 是 A. 转动转换器,换上高倍物镜 B. 移动装片,将欲观察的对象移到视野中央 C.转动细准焦螺旋
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