范文:Good morning, teachers and students! I would like to recommend my classmate Xu XX to you as xx is a rare excellent student with virtue, talent and ambition.老师、同学们好!
推荐于2017-12-16 13:09:19 最佳答案 电子书: Electronic book 简写Ebook或者是通俗的TXT或者Digital book 亦或者是 e-journal电纸书:同样还是可以称之为E-book或是E-reader 但这里在学术上来看这个E-book其实是E-ink book
an electric field is present in the dielectric. This field stores energy and produces a mechanical force between the conductors. The effect is greatest when there is a narrow separation between large areas of