Anyway,I can't cheat him—it's against all my________.
A:emotions
B:principles
C:regulations
D:opinions
求:
图中虚线为一组间距相等的同心圆,圆心处固定一带正电的点电荷.一带电粒子以一定初速度射入电场,实线为粒子仅在电场力作用下的运动轨迹,a、b、c三点是实线与虚线的交点.则该粒子( )
You have a ___ . You should stop eating anything.