With basic level industrial and commercial substation is an unit, contrast the list that operation business offers undertook type is checked helping a network.

以基层工商分局为单位，对照运营商提供的名单进行了拉网式检查。

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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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This is made possible by an active articulated torsional drive unit, which in combination with a complex control system attains an unprecedented level of efficiency in flight operation.

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