如图,直线AB∥CD,直线EF与AB,CD相交于点E,F,∠BEF的平分线与CD相交于点N.若∠1=63°,则∠2=( )
A:64°
B:63°
C:60°
D:54°
You shouldn't complain so much. Other people are ____ ____ than you.
人体的免疫系统包括____、____ 和____.
如图所示,闭合开关S后, L1和L2两盏电灯都不亮,电流表指针几乎没有偏转,电压表指针明显偏转,该电路的故障可能是()
She was born July , 1993.