A:The; the
B:A; a
C:The; a
D:A; the
如图所示,一段导线abcd位于磁感应强度大小为B的匀强磁场中,且与磁场方向(垂直于纸面向里)垂直。线段ab、bc和cd的长度均为L,且∠abc=∠bcd=1350。流经导线的电流为I,方向如图中箭头所示。导线段abcd所受到的磁场的作用力的合力( )
This is my family.My mother is a teacher.She is very friendly.My father is a basketball player.He is tall and strong.My uncle is a cook.My aunt is a nurse.I am a student.I have no job.
下列各句中,没有语病的一句是( )