【名词&注释】
精密度(precision)
[单选题]比较两组测定结果的精密度()。甲组:0.19%,0.19%,0.20%,0.21%,0.21%乙组:0.18%,0.20%,0.20%,0.21%,0.22%
A. A、甲、乙两组相同 B. B、甲组比乙组高 C. C、乙组比甲组高 D. D、无法判别