题目内容
在①.1{0,1,2,3}; ②.{1}∈{0,1,2,3};
③.{0,1,2,3}{0,1,2,3};
④.{0}上述四个关系中,错误的个数是: ( )
③.{0,1,2,3}{0,1,2,3};
④.{0}上述四个关系中,错误的个数是: ( )
A.1个 | B.2个 | C.3个 | D.4个 |
B
因为①.1{0,1,2,3};不成立
②.{1}∈{0,1,2,3};不成立
③.{0,1,2,3}{0,1,2,3};成立,
④.{0}成立,故正确的命题个数为2,选B.
②.{1}∈{0,1,2,3};不成立
③.{0,1,2,3}{0,1,2,3};成立,
④.{0}成立,故正确的命题个数为2,选B.
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