The Chopsticks Brothers ________ sings Little Apple won the International Song Award in 2014.
A:who
B:what
C:which
在△ABC中,AC=8,BC=6,AB=10,则△ABC的外接圆半径长为( )
① 19 :x= 23 :4
②x﹣ 34 x=2.5.
6-3=____
2+5=____
10-0=____
0+9=____
7-7=____