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【单选题】
下列属于一次文献的正确答案是。A.
专利说明书、索引、文摘刊物
B.
期刊论文、私人笔记、百科全书
C.
会议论文、科技报告、期刊论文
D.
字典、手册、年鉴
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】Lowenberg: Thanks a lot for 1 _______ me off at the station. Zhang: You are 2 _______. 3 _____ you enjoy your 4 _____ here? Lowenberg: Well, I must say my stay in China has 5 _____ very enjoyable and ...
【单选题】CHKD“词频”限定检索含义正确的是
A.
词频为空，表示在选择的检索项中至少出现0次检索词
B.
如果为词频数字“3”，则表示在检索项中该检索词至少出现4次
C.
一般来说，词频数字较大，表示检索结果相关度可能较高
D.
一般来说，词频数字较小，表示检索结果相关度可能较高
E.
词频最大可以选择数为13
【简答题】语法填空 “Leave a place better than you found it.” is a philosophy that I hold dear. I led 20 volunteers to help clean up the Great Wall in April. Tile Great Wall is one of the 61 (great)structu...
【简答题】Dear Ace Travel, My family and I want to take a trip this summer somewhere in eastern China. I hope you can provide me with some about the kinds of vocations that your firm can offer. We would like to...
【单选题】CHKD“词频”限定检索含义正确的是
A.
词频为空，表示在选择的检索项中至少出现0次检索词
B.
如果为词频数字“3”，则表示在检索项中该检索词至少出现4次
C.
一般来说，词频数字较大，表示检索结果相关度可能较高
D.
一般来说，词频数字较小，表示检索结果相关度可能较高中
E.
词频最大可以选择数为13
【简答题】阅读理解。 When people travel in another city or country, they sometimes stay in the homes of the local people. This is called homestay . It is a great experience because you can meet people from a differe...
【简答题】My stay in China has been very e_______________(心情愉悦的)and p_______________(富有成效的).
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