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【单选题】
设有关系模式R(A, B, C, D, E, F),其函数依赖集为{E→D,C→B, (C,E)→F,B→A},则R最高达到______ 。
A.
1NF
B.
2NF
C.
3NF
D.
BCNF
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参考答案:
举一反三
【单选题】用大地水准面围成的形体表示地球的形状和大小,称之为( )。
A.
椭球体
B.
大地体
C.
地球椭球体
D.
参考椭球体
【单选题】根据中国邮政挂号小包公布的资费报价表,俄罗斯是在第( )计费区。
A.
1
B.
2
C.
3
D.
11
【单选题】中年人便血及排便习惯改变应首先进行的检查是
A.
纤维结肠镜检
B.
腹部超声检查
C.
粪便隐血试验
D.
X线钡剂造影检查
E.
直肠指检
【简答题】One day, when I was in high school, I saw a kid named Kyle from my class walking home from school with all his books, I thought to myself, “ __1___ would anyone bring home all his books for the weeken...
【单选题】用大地水准面围成的形体表示地球的形状和大小,叫做( )。
A.
椭球体
B.
大地体
C.
地球椭球体
D.
参考椭球体
【单选题】I’d like to think decades from now, a young Chinese person ______ inspired by Expo 2010 to one day visit where I grew up, just as I’ve finally gotten to experience China in person.
A.
will have
B.
has had
C.
has been
D.
will be
【单选题】I wish I could go to Mars one day .
A.
a few days.
B.
that day.
C.
in one day.
D.
some day.
【单选题】I wish I (can) (fly to) the moon (by) spaceship (one day).
A.
can
B.
fly to
C.
by
D.
one day
【单选题】中年人便血及排便习惯改变应首先进行的检查是
A.
纤维结肠镜检
B.
腹部超声检查
C.
粪便隐血试验
D.
x线钡剂造影检查
E.
直肠指检
【简答题】已知三阶行列式D=已知三阶行列式D中第1行的元素自左向右依次为-1,1,2,它们的代数余子式分别为3,4已知三阶行列式D中第1行的元素自左向右依次为-1,1,2,它们的代数余子式分别为3,4,-5.则三阶行列式D=______.
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