如图:AB∥CD,直线MN与AB交于E,过点E作直线HE⊥MN,∠1=130°,则∠2等于( )
A:50°
B:40°
C:30°
D:60°
下列设备中利用电磁感应原理工作的是( )
Three-fourths of the buildings _________.