用显微镜观察洋葱表皮细胞,下列哪组镜头下看到的细胞数目最少( )A.10×,5×B.10×,15×C.40×
\u7528\u4e0b\u5217\u663e\u5fae\u955c\u7684\u955c\u5934\u7ec4\u5408\u5206\u522b\u89c2\u5bdf\u540c\u4e00\u6d0b\u8471\u7684\u8868\u76ae\u7ec4\u7ec7\uff0c\u770b\u5230\u7684\u7ec6\u80de\u6570\u76ee\u6700\u591a\u7684\u662f\uff08\u3000\u3000\uff09A\uff0e5\u00d7\u300110\u00d7B\uff0e10\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u8d8a\u5927\uff0c\u89c6\u91ce\u8d8a\u6697\uff0c\u770b\u5230\u7684\u7ec6\u80de\u6570\u76ee\u8d8a\u5c11\uff0c\u7ec6\u80de\u7684\u4f53\u79ef\u8d8a\u5927\uff1b\u53cd\u4e4b\uff0c\u663e\u5fae\u955c\u7684\u653e\u5927\u500d\u6570\u8d8a\u5c0f\uff0c\u89c6\u91ce\u8d8a\u4eae\uff0c\u770b\u5230\u7684\u7ec6\u80de\u6570\u76ee\u8d8a\u591a\uff0c\u7ec6\u80de\u7684\u4f53\u79ef\u8d8a\u5c0f\uff0e\u56e0\u6b64\u770b\u5230\u7ec6\u80de\u6570\u76ee\u6700\u591a\u7684\u5e94\u662f\u653e\u5927\u500d\u6570\u6700\u5c0f\u7684\uff0eA\u3001\u653e\u592750\u500d\uff1b B\u3001\u653e\u5927100\u500d\uff1bC\u3001\u653e\u5927640\u500d\uff1bD\u3001\u653e\u5927400\u500d\uff0c\u56e0\u6b64A\u7ec4\u5408\u7684\u653e\u5927\u500d\u6570\u6700\u5c0f\uff0c\u770b\u5230\u7ec6\u80de\u6570\u76ee\u6700\u591a\uff0e\u6545\u9009\uff1aA
\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\u00d710=50 \uff08\u500d\uff09\uff1bB\u7ec4\u7684\u653e\u5927\u500d\u6570\u4e3a\uff1a10\u00d710=100\uff08\u500d\uff09\uff1bC\u7ec4\u653e\u5927\u500d\u6570\u4e3a\uff1a10\u00d740=400\uff08\u500d\uff09\uff1bD\u7ec4\u653e\u5927\u500d\u6570\u4e3a\uff1a25\u00d725=625\uff08\u500d\uff09\uff0c\u56e0\u6b64\u663e\u5fae\u955c\u653e\u5927\u500d\u6570\u6700\u5927\u7684\u662fD\u3001625\u500d\uff0c\u663e\u5fae\u955c\u89c6\u91ce\u4e2d\u7ec6\u80de\u7684\u6570\u91cf\u6700\u5c11\uff0e\u6545\u9009\uff1aD\uff0e
A、显微镜的放大倍数=10×═50(倍);B、显微镜的放大倍数=10×15=150(倍);
C、显微镜的放大倍数=40×10=400(倍);
D、显微镜的放大倍数=20×10=200(倍);
因此显微镜放大倍数最大的是C、4000倍,所以C、40×,10×看到的细胞数目最少.
故选:C.
绛旓細A銆鏄惧井闀鐨勬斁澶у嶆暟=10脳鈺50锛堝嶏級锛汢銆佹樉寰暅鐨勬斁澶у嶆暟=10脳15=150锛堝嶏級锛汣銆佹樉寰暅鐨勬斁澶у嶆暟=40脳10=400锛堝嶏級锛汥銆佹樉寰暅鐨勬斁澶у嶆暟=20脳10=200锛堝嶏級锛 鍥犳鏄惧井闀滄斁澶у嶆暟鏈澶х殑鏄疌銆4000鍊嶏紝鎵浠銆40脳锛10脳鐪嬪埌鐨缁嗚優鏁扮洰鏈灏戯紟鏁呴夛細C锛
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