A:broken, playing
B:break, play
C:broken, played
D:broke, was playing
如图,△ABC中,AB=5,BC=3,AC=4,以点C为圆心的圆与AB相切,则⊙C的半径为( )
请将下列图中电路连接完整,连接时要求符合安全用电的规定.