光缆引入ODF架或综合柜终端熔接时，光缆加强芯须（）。
参考答案：良好接地
How I wish I could sleep longer! However, I had to get up as soon as the alarm clock _________.
A. ran off B. went off C. took off
从区系性角度上看，除南非以外的非洲南部地区属于（）。
A、全北区
B、古热带区
C、新热带区
D、开首区
