设计布线时，需要考虑哪些主要因素？
参考答案：
网络拓朴结构、布线电缆、外界干扰系统的扩展和投资等。
By the time he realizes he________into a trap, it'll be too late for him to do anything about it.[ ]
A. walks
B. walked
C. has walked
D. had walked
下述肾阴虚型绝经前后诸证的主证中，哪项是错误的（）
A.烘热汗出
B.尿频失禁
C.烦躁易怒
D.失眠多梦
E.头晕耳鸣
