【单选题】
设A和B皆为n阶实方阵，则下面论断错误的是()。
①
<SPANstyle="FONT-SIZE:10.5pt；FONT-FAMILY:宋体；mso-bidi-font-size:12.0pt；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA；mso-ascii-font-family:TimesNewRoman；mso-hansi-font-family:TimesNewRoman；mso-bidi-font-family:TimesNewRoman">A与B</SPAN><SPANlang=EN-USstyle="FONT-SIZE:10.5pt；FONT-FAMILY:TimesNewRoman；mso-bidi-font-size:12.0pt；mso-fareast-font-family:宋体；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA"><SPANstyle="POSITION:relative；TOP:2pt；mso-text-raise:-2.0pt"></SPAN></SPAN><SPANstyle="FONT-SIZE:10.5pt；FONT-FAMILY:宋体；mso-bidi-font-size:12.0pt；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA；mso-ascii-font-family:TimesNewRoman；mso-hansi-font-family:TimesNewRoman；mso-bidi-font-family:TimesNewRoman">相似的充要条件是存在可逆阵P</SPAN><SPANstyle="FONT-SIZE:10.5pt；FONT-FAMILY:宋体；mso-bidi-font-size:12.0pt；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA；mso-ascii-font-family:TimesNewRoman；mso-hansi-font-family:TimesNewRoman；mso-bidi-font-family:TimesNewRoman">，使得A=P<SUP>-1</SUP>BP</SPAN>
②
若A是反对称矩阵，则A<SUP>T</SUP>=-A</P>
③
若A可逆，则A可以表示成若干个初等矩阵的乘积
④
若A是正交矩阵，则|A|=1