A:轴突和树突
B:树突和轴突
C:轴突和轴突
D:树突和树突
如图,闭合开关使螺线管通电,当滑片P向右移动时螺线管的磁性将 ____(选填“增强”、“减弱”或“不变”).此过程,可以观察到左边弹簧将 ____,右边弹簧将 ____(选填“伸长”、“缩短”或“不变”).
His wife, to whom he _____ for 20 years, died of cancer last Thursday. ( )
小星跳高的高度和他的身高____比例。(填“成”或者“不成)