Road vehicles . three - dimensional reference system and fiducial marks . definitions 道路车辆.三维参考系和基准标记.定义
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Phase datum mark 相位基准标记
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The graduated 200 < mu > l tips have a reference mark at 10 < mu > l so you can check pipettor calibration and visually estimate sample size 200微升刻度的吸头,在10微升处有基准标记,可检查移液器刻度和估计样本容量。