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   We invite you to join us this summer for the First ePals Conferencel     Dear ePals Community Member, ePals will hold its first conference for tech directors and teachers on Tuesday, July 15, in Boston. Our one-day event is a pre-conference of Alan. November’s Building Learning Commurities 2008 Conference. Come see how ePals, the Internet’s largest social learning network, can transform your classroom, school and district with our award-winning, safe and protected School M@ilTM and SchoolBlogTM offered at no cost. ePals team members, expert teachers and instructional technolo如图所示的四幅图，其中属于电磁感应现象实验图及其应用图的是A.①③B.①④C.②③D.②④