如图所示,若△ABC∽△DEF,则∠E的度数为( )
A:28°
B:32°
C:42°
D:52°
It's important_______ the piano well.
关于光现象,下列说法正确的是
若∠AOB=∠A1O1B1,且OA∥O1A1,OA与O1A1的方向相同,则下列结论正确的是( )