挑战习题
1/5单选题
难度:

1.下面说法正确的是(  )
A有理数是整数
B 有理数包括整数和分数
C整数一定是正数
D有理数是正数和负数的统称
提示1:
PGI+5qC55o2u5pyJ55CG5pWw55qE55u45YWz5qaC5b+15YiG5p6Q5Yik5patPC9iPg==
正确答案:Qg==
PGI+5pW05pWw5ZKM5YiG5pWw57uf56ew5Li65pyJ55CG5pWw77yMPC9iPjxiPkE8L2I+PGI+6ZSZ6K+v77yb5pW05pWw5ZKM5YiG5pWw57uf56ew5pyJ55CG5pWw77yM6L+Z5piv5qaC5b+177yMPC9iPjxiPkI8L2I+PGI+5q2j56Gu77yb5pW05pWw5Lit5Lmf5ZCr5pyJ6LSf5pW05pWw77yMPC9iPjxiPkM8L2I+PGI+6ZSZ6K+v77yb5pyJ55CG5pWw5piv5q2j5pWw44CB6LSf5pWw5ZKMPC9iPjxiPjA8L2I+PGI+55qE57uf56ew77yM5omA5LulPC9iPjxiPkQ8L2I+PGI+6ZSZ6K+v77yO5pWF6YCJPC9iPjxiPkI8L2I+