已知直角三角形的两直角边长分别为5和12，则它的外接圆半径R=（ ），内切圆半径r=（ ）。
6.5；2
Mr. King made his son _____ for him for a long time. [ ]
A. wait
B. to wait
C. waited
理想的橡胶硫化曲线应满足哪些条件？
