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【单选题】
ScienceDirect数据库的截词功能可以使用哪个通配符表示?( )
A.
空格
B.
&
C.
*
D.
%
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
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． the ； the        
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相关题目：
【单选题】如果现在LED是点亮状态,那么执行语句LED=~LED; 后,LED的状态是( )。
A.
闪一下
B.
一直闪
C.
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