局域网的典型特征是()
A、低数据数率,小范围,高误码率
B、高数据数率,大范围,高误码率
C、高数据数率,小范围,低误码率
D、低数据数率,小范围,低误码率
参考答案:C
Tim's mum is worried _____ her son's eyesight as he plays online games too much.[ ]
A. for
B. about
C. with
D. of
梭伦改革的主要内容和历史意义。