A:They will climb a mountain this weekend.
B:They will climb a mountain next weekend.
C:They don't climb a mountain on weekends.
心理学研究表明,女生往往擅长于具体性思维,男生往往擅长于抽象逻辑思维。这说明( )
下列有关热现象的解释,错误的是( )
因式分解:a2﹣4=____ .