单项选择题
A.±1,0.03,0.04B.±2,0.03,0.05C.±2,0.02,0.04D.±1,0.02,0.05
A.800,1250B.900,1500C.800,1500D.900,1250
A.800,1250,4B.1000,1300,5C.1200,1500,6D.1500,2000,8