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【单选题】
下列集合只能用描述法表示的是 ()
A.
大于-5且小于3的所有实数组成的集合
B.
4x-5=3的
C.
绝对值小于2的所有整数组成的集合
D.
小于6的所有正整数组成的集合;
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参考答案:
举一反三
【简答题】Read the following paragraphs carefully and write a topic sentence for each paragraph. 1. Famous inventor Thomas Edison, for instance, did so poorly in his first years of school that his teacher warne...
【单选题】He did poorly in his examination,______ how hard he had studied for them.
A.
considering
B.
to consider
C.
thinking
D.
regarding
【单选题】He did poorly in his examinations, ______ how hard he had studied for them.
A.
considering
B.
to consider
C.
thinking
D.
regarding
【单选题】He did poorly in his examinations, ______ how hard he had studied for them.
A.
considering
B.
to consider
C.
regarding
D.
to regard
【单选题】He did poorly in his examination, ______ how hard he had studied for them.
A.
considering
B.
to consider
C.
regarding
D.
to regard
【单选题】在关系模式中,实现“关系中不允许出现相同的元组”的约束是()约束。
A.
候选键
B.
主键
C.
D.
任一键
【简答题】2 请回忆所学请求信常用句型
【单选题】在关系模式中,实现“关系中不允许出现相同的元组”的约束是( )。
A.
候选键
B.
主键
C.
D.
任一键
【简答题】若x,ij和k都是int型变量,则计算表达式x=(i=4,j=16,k=32)后,X的值为( )。 A)4 B)16 C)32 D)52
【单选题】若x,i,j和k都是int型变量,则执行下面表达式后X的值为()
A.
32
B.
4
C.
16
D.
52
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