若反馈信号与原系统输入信号的方向相反则为（）。
参考答案：负反馈
用所给词的适当形式填空。
1. What time______school ______ (start)?
2. My father______ (take)a shower at 10:00.
3. Mr Smith usually______ (work) at night.
4. What time______your sister______ (have)a shower?
5. Do you want ______ (know) about your family?
组织变革的阻力是直接的、公开的。( )
