天线伸出铁塔平台距离应不小于（）。
A.5m
B.4m
C.2m
D.0.5M
参考答案：C
The doctors the medicines to the people in the flood area. [ ]
A.distinguished
B.choose
C.annoyed
D.distributed
什么叫铁心的叠片系数和填充系数？
