A.System.SysThread B.System.Thread C.System.Threading D.NetException
A.DG 1dg1=delegate {return 0.3;}; B.DG 1dg2=delegate {return a;}; C.DG 1dg3=delegate (int a,ref double b) {return a;}; D.DG 1dg4=delegate (int a,ref double b) {return a/b;};