A、<span style="font-family: 宋体; font-size: 14px; text-align: justify; text-indent: 28px; background-color: rgb(255, 255, 255);">倒金字塔结构</span>
B、<span style="font-family: 宋体; font-size: 14px; text-align: justify; text-indent: 28px; background-color: rgb(255, 255, 255);">并列结构</span>
C、<span style="font-family: 宋体; font-size: 14px; text-align: justify; text-indent: 28px; background-color: rgb(255, 255, 255);">顺时结构</span>