﹣1, 12 ,﹣ 13 , 14 ,﹣ 15 , 16
—Did Kate do best in the final exam?
—No, but of all the students she did _______.
关于人类活动与地震关系的叙述,正确的是( )
当开关S闭合后,螺线管的北极如图所示,请在图中标出电源的正极和置于螺线管正上方小磁针的N极。