\hat{A}
\widehat{A}
\tilde{A}
\widetilde{A}
\overline{A}
\underline{A}
\overbrace{A}
\underbrace{A}
\overset{a}{b}
\underset{a}{b}
\overleftarrow{A}
\overrightarrow{A}
时间: 2024-08-12 21:34:09
\hat{A}
\widehat{A}
\tilde{A}
\widetilde{A}
\overline{A}
\underline{A}
\overbrace{A}
\underbrace{A}
\overset{a}{b}
\underset{a}{b}
\overleftarrow{A}
\overrightarrow{A}