简述推膝拨腰动作方法。
参考答案：
由甲两臂夹住乙颈部开始。乙迅速下蹲，右手推握甲右膝外侧，左手环抱甲腰部；右手向后推甲右膝，左前臂向外拨甲腰部。
分压式偏置的共发射极放大电路中，若VB点电位过高，电路易出现（）。
A、饱和失真
B、截止失真
C、双向失真
D、晶体管被烧损
The hours when the children spend in their one-way relationship with television people, undoubtedly affect their relationships with real-life people.
