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【单选题】
下列哪个表示的是查全率（）注：查全率是检索出的相关文档数和文档集中所有的相关文档数的比率．衡量的是检索系统（搜索引擎）的查全率；查准率是检索出的相关文挡数与检索出的文档总数的比率。A.
（检出相关文献量/文献库内相关文献总量）×100％
B.
（检出相关文献量/检出文献总量）×100％
C.
（检出不相关文献量/文献库内相关文献总量）×100％
D.
（检出不相关文献量/检出文献总量）×100％
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举一反三
【简答题】用括号里所给词的正确形式填空。 1. Maria (tell) Mlke that Li Lei would get on well with others. 2. In English, he is better at (read) than (listen). 3. It seemed that they (live)a hard life. 4. He told me a piece of ...
【单选题】— Do you think Li Hua has passed the English examination? — No, If so, he ______ us yesterday.
A.
would tell
B.
told
C.
would have told
D.
had told
【简答题】用所给词的适当形式填空。 1. Li Hong is ___________ (make) a call. 2. Would you like ___________ (swim) with us? 3. My father ___________ (feel) happy. 4. Don't ___________ (hang) up the phone, please.
【简答题】He said he would ____ me to Mr Li as his assistant but he didn’t. A. comment B suggest C. command D. recommend
【单选题】He is a man of integrity. He would ______ kill himself as betray his country.
A.
as soon
B.
like to
C.
rather
D.
never
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