U MU 创新的三分屏直播功能,目前已实现了以下哪几方面的同时进行? A. 直播讲授 @font-face{ font-family:"Times New Roman"; } @font-face{ font-family:"宋体"; } @font-face{ font-family:"Calibri"; } mso-level-number-format:lower-roman; mso-level-suffix:tab; mso-level-text:"%9."; mso-level-tab-stop:none; mso-level-number-position:right; margin-left:210.6000pt;text-indent:-21.0000pt;font-family:'Times New Roman';} p.MsoNormal{ mso-style-name:正文; mso-style-parent:""; margin:0pt; margin-bottom:.0001pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; font-family:Calibri; mso-fareast-font-family:宋体; mso-bidi-font-family:'Times New Roman'; font-size:10.5000pt; mso-font-kerning:1.0000pt; } mso-style-name:"List Paragraph"; margin:0pt; margin-bottom:.0001pt; text-indent:21.0000pt; mso-char-indent-count:2.0000; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; font-family:Calibri; mso-fareast-font-family:宋体; mso-bidi-font-family:'Times New Roman'; font-size:10.5000pt; mso-font-kerning:1.0000pt; } span.msoIns{ mso-style-type:export-only; mso-style-name:""; text-decoration:underline; text-underline:single; color:blue; } span.msoDel{ mso-style-type:export-only; mso-style-name:""; text-decoration:line-through; color:red; } } div.Section0{page:Section0;} B. 讲稿互动 C. 师生 D. 聊天回复