In the arc extinguishing assembly of the switching device, by means of the first arc guide board and the second arc guide board prepared from the electromagnetic pure iron, the magnetic field force applied onto the electric arc by the first arc guide board and the second arc guide board can...
表1 玩具外壳及电路板中十溴联苯醚含量(μg/g) Table 1 Contents of PBDEs in printer and circuit board samples (μg/g) 表2 玩具产品中多溴联苯醚含量表(μg/g) Table 2 Contents of PBDEs in toy samples (μg/g) 表3 电路板中多溴联苯醚含量(...