用下列显微镜观察洋葱表皮细胞，视野中细胞数目最少的显微镜可能是哪一台（ ）A．目镜5X、物镜8X的显
\u7528\u4e0b\u5217\u56db\u53f0\u663e\u5fae\u955c\u89c2\u5bdf\u6d0b\u8471\u8868\u76ae\u7ec6\u80de,\u89c6\u91ce\u4e2d\u7ec6\u80de\u6570\u76ee\u6700\u5c11\u548c\u7ec6\u80de\u4f53\u79ef\u6700\u5c0f\u7684\u663e\u5fae\u955c\u5206\u522b\u662f1\u76ee\u955c5x\u548c\u7269\u955c8x 2A4\u548c1 \u7ec6\u80de\u6570\u76ee\u6700\u5c11\u5219\u8981\u653e\u5927\u500d\u6570\u6700\u5927\uff0c\u7ec6\u80de\u4f53\u79ef\u6700\u5c0f\u5219\u9700\u8981\u4e2a\u6570\u6700\u591a\uff0c\u653e\u5927\u500d\u6570\u6700\u5c0f
\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u8d8a\u5927\u6240\u89c2\u5bdf\u5230\u7684\u8303\u56f4\u8d8a\u5c0f\uff0c\u89c2\u5bdf\u5230\u7684\u7ec6\u80de\u5c31\u8d8a\u5c11\uff1b\u53cd\u4e4b\uff0c\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u8d8a\u5c0f\u6240\u89c2\u5bdf\u5230\u7684\u8303\u56f4\u8d8a\u5927\uff0c\u89c2\u5bdf\u5230\u7684\u7ec6\u80de\u5c31\u8d8a\u591a\uff0e\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u2550\u76ee\u955c\u7684\u653e\u5927\u500d\u6570\u00d7\u7269\u955c\u7684\u653e\u5927\u500d\u6570\uff0c\u89c6\u91ce\u4e2d\u7ec6\u80de\u6570\u76ee\u6700\u5c11\u7684\u663e\u5fae\u955c\uff0c\u5e94\u662f\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u6700\u5927\u7684\u4e00\u7ec4\uff0eA\u7ec4\u7684\u653e\u5927\u500d\u6570\u4e3a\uff1a5\u00d78=40\uff08\u500d\uff09\uff1bB\u7ec4\u7684\u653e\u5927\u500d\u6570\u4e3a\uff1a10\u00d740=400\uff08\u500d\uff09\uff1bC\u7ec4\u653e\u5927\u500d\u6570\u4e3a\uff1a15\u00d710=150\uff08\u500d\uff09\uff1bD\u7ec4\u653e\u5927\u500d\u6570\u4e3a\uff1a20\u00d745=900\uff08\u500d\uff09\uff0c\u56e0\u6b64\u653e\u5927\u500d\u6570\u6700\u5927\u7684\u662fD900\u500d\uff0c\u89c6\u91ce\u4e2d\u7ec6\u80de\u7684\u6570\u76ee\u6700\u5c11\uff0e\u6545\u9009D
A、目镜是5×，物镜是8×，显微镜的放大倍数是40×；B、目镜是10×，物镜是40×，显微镜的放大倍数是400×；
C、目镜是15×，物镜是10×，显微镜的放大倍数是150×；
D、目镜是20×，物镜是45×，显微镜的放大倍数是900×；
由上可见D选项中显微镜的放大倍数最大，视野中细胞数目最少．
故选：D．
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