若{1,2}   A{1,2,3,4,5},则集合A的个数是(    )    (A)8 

{12}   A{12345},则集合A的个数是(   

   A8      B7     C4     D3

答案

 A

相关题目

食醋中含有醋酸(CH3COOH),下列关于醋酸的说法正确的是(
食醋中含有醋酸(CH3COOH),下列关于醋酸的说法正确的是(    ) A.醋酸的相对分子质量为60g         B.醋酸中CHO三种元素的质量比为1:2:1 C.
Have you got a free evening next week?       , let’s have dinner. A. Whi
Have you got a free evening next week?       , let’s have dinner. A. While so B. Since so C. When so      D. If so
的倒数是(   ) A.-3                     B.3  
的倒数是(   ) A.-3                     B.3                         C.                       D.
—Could you please help me carry the desk?    —__________.    A. No, th
—Could you please help me carry the desk?    —__________.    A. No, thanks.    B. Not at all.   C. I’d love to.   D. It doesn’t matter.
____computers play such an important part in our daily life? A.Why it is that
____computers play such an important part in our daily life? A.Why it is that B.Why is it that C.Why was it that D.Why is it
把下面4句话按恰当顺序填入横线处(只填序号),使之成为
把下面4句话按恰当顺序填入横线处(只填序号),使之成为语义连贯的一段话。 在先秦,主要有五种人格理想:墨子的苦行侠人格,            
He ________ read the book ________ remembered what he had read.     A. betwe
He ________ read the book ________ remembered what he had read.     A. between, and   B. not only, but also   C. not,  but   D. both, with

最新题目