A:2个
B:3个
C:4个
D:5个
①有理数的绝对值一定是正数;
②互为相反数的两个数,必然一个是正数,一个是负数;
③若|a|=|b|,则a与b互为相反数;
④绝对值等于本身的数是0;
⑤任何一个数都有它的相反数.
其中正确的个数有( )
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