1.已知集合U=10,1、234),集A=1223.auAB0,2.4C1.2.3D012.42.若数xi(8-2iG数单位)则A2-3B2+3C.3+2已为第二象角ian2ncD4.若等数列a.1满20A.24B23C.17D16 i atrag