判断题
非线性系统当输入为正弦信号时，输出是同频率的正弦信号。（）
错误(↓↓↓ 点击‘点击查看答案’看答案解析 ↓↓↓)
单项选择题 External focalization means that the orientation is associable with that of any character ____ the text.
单项选择题 民警在识别可疑爆炸物时,是错误的做法（）
未知题型 Gothic architecture features pointed arches and vaults, flying buttresses, narrow spires, stained glass windows and so on.
