为找出原因，研究人员用精密X射线分析仪测定了变成褐色颜料的精确化学成分。
To find out why, researchers used sophisticated X-ray analyses to determine the exact chemical composition of the paint as it browns.
用微分电位溶出法测定香烟中铅灵敏度高，稳定性好，精密度和准确度均符合微量分析的要求。
The differential potentiometric stripping analysis has high sensitivity and stability in determining lead in cigarette and its precision and accuracy are up to the standard of microanalysis.
为了保证用轨迹成型法加工光学零件的面形精度，对精密磨削机床影响工件面形误差的因素进行了理论分析。
In order to guarantee surface precision of using locus shaping method machining optical parts, the factors of fine grinding machine which affects surface error of part is theoretically analysed.
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