在制作口腔上皮细胞临时装片时，不用清水而用生理盐水，主要是为

在制作口腔上皮细胞临时装片时，不用清水而用生理盐水，主要是为了（）

A．保持细胞的正常形态 B．杀死细胞

C．杀灭细菌 D．使细胞分散开

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