问题:是/不是标识符? my variable myvariabley pins X java&uml X MYVARIABLE My Variable X Smyvariable ns a+c p testing1-2-3 X It's X 猫√ 2021/2/242021/2/24 5 问题: 是/不是 标识符? – myVariable – 9pins – MYVARIABLE – i – a+c – testing1-2-3 –_myvariable – java&uml – My Variable – $myvariable – _9pins – It's – 猫