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【单选题】
What is the distance between the Earth and the two areas of radiation?
A.
Between 12 and 21 miles
B.
1,000 miles
C.
150 miles
D.
1,500 miles
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参考答案:
举一反三
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【多选题】计算机信息检索经历了( )四个阶段
A.
脱机批处理检索
B.
联机检索
C.
光盘检索
D.
网络检索
【单选题】信息检索经历了手工检索、脱机检索、练级检索、()四个发展阶段。
A.
网络检索
B.
计算机检索
C.
数据库检索
D.
智能检索
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