在较短的神经节段，复合肌肉动作电位的波幅和时限急剧改变高度提示（）
A.神经传导阻滞
B.轴索变性
C.神经元变性
D.神经根病变
参考答案：A
阅读下列电视广告词“If we didn’t save water, the last drop of water would be our tear(眼泪) drop.”根据提示写一篇80词左右的短文。 要求：字迹端正，语句通顺，语法正确。
_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ ______________________________________________________
___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
空气主动式悬架由电磁阀驱动。（）
