2. 外语
  3. A using photos B description of the HTML page C current popular search engines D document search E information in images F machi

A using photos B description of the HTML page C current popular search engines D document search E information in images F machi

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问题 A using photos
B description of the HTML page
C current popular search engines
D document search
E information in images
F machine vision systems
The new system was found more effective in document search than the______.
选项
答案C
解析 根据最后一段“…produced a 30 percent improvement in precision over the originalsearch engine…”可知，新系统在文件搜索上比当前通常使用的搜索引擎更高效。
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