皮皮学，免费搜题
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搜题
【单选题】
在中国国家图书馆（http：//www.nlc.gov.cn）上进行书刊目录查询，实际上是在访问（）A.
电子表格文件
B.
word文件
C.
数据库
D.
文本文件
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
break into
B.
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C.
fit into
D.
look into
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