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have been introduced have introduced are introducing are introduced
will visit am going to visit will be visiting would visit
produced being produced to be produced having been produced
did had done was doing have done
Given To give Giving Having given
came；would meet had come；would have met come；will meet had come；would met
is are have been has been
knowing know to know being known
the : the an :不填 an : the the : a
What；what That；that What；that That；what
线圈平面与磁场垂直时，产生的感应电动势最大 线圈平面与磁场平行时，磁通量变化最快 线圈产生交变电动势的有效值为30V 线圈产生交变电动势的周期为0.01s
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