It supplies valuable reference for teaching and training of 800-meter.
对800米跑的教学、训练有一定的参考价值。
And its calibration method study took that of the whiteness meter as reference.
参考白度计的校准方法对铅芯浓度仪的校准方法进行了研究。
And its calibration method study took that of the whiteness meter as reference.
参考白度计的校准方法对铅芯浓度仪的校准方法进行了研究。
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