高等继续教育 / 计算机专业英语
正确率：100%
题型描述: 多选题
In electronic commerce ,information search and discovery services include ( ).
A. information filters
B. search engines
C. electronic catalogs
D. software agents
E. directories
In electronic commerce ,information search and discovery services include ( ).
A. information filters
B. search engines
C. electronic catalogs
D. software agents
E. directories
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