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【多选题】
如果检索结果过多,误检率很高,需要调整检索范围,以提高检索结果的查准率。此时调整检索策略不能采用的方法有A.
用逻辑“与”或者逻辑“非”增加限制概念
B.
用逻辑“或”或截词增加同族概念
C.
用字段算年份增加辅助限制
D.
用“在结果中检索”增加限制条件
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反馈参考答案：
举一反三
【多选题】关于IgG的叙述，下列哪些是正确的?
A.
有 4 个亚类
B.
大多数抗菌、抗毒素抗体属于 lgG
C.
能激活补体
D.
是初次免疫应答产生的主要抗体
E.
能与 SPA 结合
【简答题】The last time we had a family reunion was ________ my brother’s wedding ceremony four years ago. A) in B) at C) during D) over
【简答题】阅读理解。 I'm a school girl. My brother and I are twins. We are both at school. We like school. My parents are both teachers. They work hard. My brother and I study at No. 1 Middle School. There are twent...
【单选题】My father told me last night ______ we're going to the Food Festival this weekend. My brother and I felt very excited. [ ]
A.
whether
B.
where
C.
what
D.
that
【单选题】When we were young, every evening my brother and I ___ stay at home waiting for my mother?
A.
might
B.
would
C.
should
D.
could
【简答题】看图选词完成短文。 friend, eight, brother, His, robot, My, is, Paul Paul I am 1______________. I am 2______________. 3______________ father is a fireman (消防员). My mother 4______________ a nurse (护士). I have on...
【简答题】选词填空，完成下列短文。 fly restaurant likes have theatre On Sundays, my father, mother, brother and I often ____________ fun together. In the morning, we go to the ____________ to watch a movie,...
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