一带电粒子与磁感应线成任意角度射入匀强磁场 则它作___运动; If the electric particle and the
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一带电粒子与磁感应线成任意角度射入匀强磁场,则它作___运动; If the electric particle and the magnetic induction line are injected into the uniform magnetic field at any Angle, it will do ___ motion.
A.直线; straight lines;
B.变速率圆周; speed change rate of the circumference;
C.匀速率圆周; uniform speed of the circumference;
D.(D)螺线; spiral;

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粒子从a到b,带负电
