模拟定位机用于放射治疗始于20世纪()
A、40年代末C
暂无解析
句子写作：Mypresentationseemedtogowell.
句子写作：Suchanattitudewouldemphasizethevalueoflife.
Ifyou_______inbehavinginthiswayyouwillbringyourselfnothingbuttrouble.
WhichoftenfollowingstatementsisnottrueaboutBritishcoalmining?
Duringthe1990smanyAustralianscalledfortheirnationtobecomearepublicwith________.
