• 1. Special level instrument: 特别水平仪 | 特殊的液位仪表 | 特别液位仪表

• 1.The method has advantages of simple operation, good linearity, cheaper reagents with little toxic, and it does not need the special precision instrument. The method is suitable for basic level unit.
  该方法简单，线性好，使用的试剂毒性小且廉价易得，不需特殊精密检测仪器，适用于基层单位。
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