已知∠A与∠B互余,若∠A=70°,则∠B的度数为( )。
20°
The red flag looks extremely beautiful the blue sky and white clouds.
A.through
B.against
C.across
D.beyond
麦门冬汤中麦冬与半夏的比例是
A.1:1B.2:1C.5:1D.6:1E.7:1