挑战习题
1/5单选题
难度:

1.集合用区间表示为(    )
A
B
C
D
提示1:
IOW9k+espuWPt+aYr+KAnDxpbWcgd2lkdGg9MTAgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQ0YvNTAvckJBQ0UxUHRwcDJnMHNkTEFBQUE1bEMzM0JzNjM1LnBuZyI+4oCd77yM5Yy66Ze055qE5bem56uv55So4oCcPGltZyB3aWR0aD0yMiBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DRi81MC9yQkFDRTFQdHBwMmlhYjNyQUFBQk5EX1lXd0EwOTYucG5nIj7igJ3mnaXooajnpLrvvIw=
提示2:
IOacieetieS6juWPt+eahOS4gOerr+imgeeUqOmXreWMuumXtA==
正确答案:RA==
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