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①物镜越长，放大倍数越_大__，距离装片越_近__，如
【解析】选C。细胞学说是由德国科学家施莱登和施旺 创立的。细胞最早是由英国科学家虎克发现并命名的。 细胞学说揭示了细胞的统一性和生物体结构的统一性。
考点二 用显微镜观察多种多样的细胞 【核心知识通关】
1.实验原理：将细胞_放__大__，更清晰地观察到细胞的形 态、结构，有利于区别不同的细胞。
2.实验步骤： (1)低倍镜：取镜→安放→_对__光__→压片→_调__焦__→观察。 (2)高倍镜观察的“四字诀”。 ①“找”：在_低__倍__镜__下“找”到目标。 ②“移”：“移”动装片，使目标位于_视__野__中__央__。 ③“转”：“转”动_转__换__器__，换用高倍镜。 ④“调”：“调”节_光__圈__，使视野亮度适宜；“调” 节_细__准__焦__螺__旋__，使物像清晰。
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