【单选题】关于产生感应电流的条件,以下说法中正确的是
B.
导体做切割磁感线运动,导体中就一定有感应电流
C.
穿过闭合电路的磁通量不为零,闭合电路中就一定产生感应电流
D.
无论什么方法,只要穿过闭合回路的磁通量发生变化,闭合电路中就一定产生感应电流
【简答题】词形填空。 1. How many ______ (teacher) are there in your school? 2. I have three _______( watch ). 3. There are some _______( orange) on the table. 4. Tom is a little _______ ( strong) than Mike. 5. I thi...
【简答题】In the current economic downturn, many American schools are adding a new subject to the curriculum(课程); financial literacy. One program in Virginia even gets students out of the classroom for a day to...