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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;
参考答案和解析
粒子从a到b，带负电
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