题型:问答题 如图所示,在匀强电场和匀强磁场共存的区域内,电场场强为E,方向竖直向下,磁场的磁感应强度为B,方向垂直纸面向里,一质量为m的带电粒子,在场区内的一竖直平面做匀速圆周运动,则可判断该带电质点( )A.带有电量为的正电荷B.运动的角速度为C.沿圆周逆时针运动D.运动的速率为 查看答案
题型:问答题 Safety regulations are being________by company managers in the drive to increase profits. That's why the accident happened.[ ]A.left B.thrownC.ignored D.emphasized 查看答案