表面粗糙度比较样块
Comparison specimens for surface roughness
对比度比配函数
contrast matching function
~(99m)Tc和~(99)Mo的强度比
99m)Tc and ~(99)Mo intensity ratio
Fe3+和Fe2+浓度比
the concentration of Fe3+ to Fe2
FRP-混凝土宽度比
FRP-to-concrete width ratio
pH指示剂吸光度比法
pH-Indicator Absorbance Ratio Method
pH指示剂吸收度比值法
pH indicator absorptin ratio method
The absorbance ratio method of pH indicator
靶与非靶比：靶与非靶器官放射性强度比
target to non target ratio