如图所示,一导线弯成半径为a的半圆形闭合回路。虚线MN右侧有磁感应强度为B的匀强磁场。方向垂直于回路所在的平面。回路以速度v向右匀速进入磁场,直径CD始终与MN垂直。从D点到达边界开始到C点进入磁场为止,求此过程中:1.感应电流方向2.感应电动势最大值3.感应电动势平均值 答案: 1.感应电流方向D→C 2.感应电动势最大值E=Bav3.解析:略 5、Mary wanted to travel around the world all by
herself, but her parents did not _______ her to do so.
A.
forbid B. allow
C. follow
D. ask