一下哪个检索式检出的文献最多:a and b,a not b,a or b,a and b and c
在布尔逻辑检索中:1.(A AND B)OR C,说明ABC三个概念之间的关系是什么2.(北京or上海)and方言not
为扩大检索范围,增加检索词的同义词,它们之间的逻辑关系是 A or B and C not
A or b And why?
Peter has_____car______no house.A no and B no or C not and D
She have a sister______brother.A.or B.and C.no
i have not a brother ( ) sister ? A: or B: and C : also
both a and b
Jim doesn\\\'t have a brother___sister? A.and B.and a C. or
Jim doesn\\\'t have a brother___sister?A.and B.and a C.or D.
Don't run walk here A.and B./ C or
Amy ____ Alice are twin.A.or B.and C./
Don't run ____jump here.a.and b./c.or