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堵景寇2200宝妈们.两个月的宝宝舌头上面很白是怎么了? - 育儿问答 -
单胞壮13670256571 ______ 这是舌下唾液腺,每人都有.只是小孩的唾液分泌比成年人多一点.

堵景寇2200...以速率v喷入磁场,A、B两板间便产生电压.已知每个金属板的面积为S,它们间的距离为d,匀强磁场的磁感应强度为B.当发电机稳定发电时,下列说法正确... -
单胞壮13670256571 ______[选项] A. A板为发电机的正极 B. B板为发电机的正极 C. 发电机的电动势为Bdv D. 发电机的电动势为BSv