腭 * * 位于
A．上颌两中切牙之间B．上颌尖牙之舌侧C．硬腭的皱襞上D．软硬腭交界处中线上E．腭中缝前端上颌中切牙之舌侧6～8mm
参考答案：E
—What are you supposed to do while chatting with friends on the Internet so that the other person doesn't ?
—You are supposed to type quickly.[ ]
A. become annoying
B. feel boring
C. get bored
D. get used to it
在项目管理组织结构图中，如果两个单位之间有管理指令关系，则采用( )联系。
A．双向箭杆 B．单向箭杆 C．矩形框 D．菱形框
