题目

One of the best gifts a family can enjoy during Father’s Day weekend is spending quality time together. This is just one way to celebrate dads for all they do for their kids. As a lot of families plan Father’s Day weekend celebrations, Chase is inviting dads and their kids to enjoy a series of special activities at the Jacksonville Zoo one day before the big day. What: Kids of all ages can make cards for dads, get their faces painted, draw with chalks, and more there. Delicious cookies from a local bakery will also be served Where: Trout River Plaza at the Jacksonville Zoo 370 Zoo P穿过某线圈的磁通量随时间变化的Φ-t图象，如图所示，下面几段时间内，产生感应电动势最大的是（　　）①0-5s    ②5-10s       ③10-12s  ④12-15s．A．①②B．②③C．③④D．④