以下检索出文献最少的检索式是。()
A. a and b;
B. a and b or c;
C. a and b and c;
D. (a or b) and c。
A. a and b;
B. a and b or c;
C. a and b and c;
D. (a or b) and c。
A、AandB
B、AorB
C、AandBandC
D、AorBorC
E、AnotB
A、High(w)pressure and react* and device
B、High(w)pressure and react* and apparatus
C、High(w)pressure and react* and (device or apparatus or equipment)
D、High(w)pressure(w)react(w)device
A、py=2006and肺癌and手术治疗
B、py=2006and(肺癌or手术治疗)
C、py>=2006and肺肿瘤and手术治疗
D、py>=2006and肺肿瘤/外科学
B.“informationretrieval”
C.informationretrieval
D.informationretrieval/TI
为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!