A、<span style="font-family: 楷体; font-size: 19px; text-indent: 37px;">数字图书</span>
B、<span style="font-family: 楷体; font-size: 19px; text-indent: 37px;">在线教育</span>
C、<span style="font-family: 楷体; font-size: 19px; text-indent: 37px;">网络门户</span>
D、<span style="font-family: 楷体; font-size: 19px; text-indent: 37px;">电子商务</span>