问题
选择题
— ____________________?
— A board, two lights, many desks and chairs.[ ]
A. Where is the classroom
B. What's in the classroom
C. What in the classroom
答案
答案：B
搜题请搜索小程序“爱下问搜题”
— ____________________?
— A board, two lights, many desks and chairs.[ ]
A. Where is the classroom
B. What's in the classroom
C. What in the classroom
答案：B
与电场强度之间满足：
。为何说该式表面时变电场与时变磁场之间存在耦合。