Impact and progress Frontiers' impact Progress Report 2022 All annual reports ...

磁性材料：开关变压器使用的磁性材料为软磁铁氧体，按其成分和应用频率可分为MnZn系和NiZn系两大类。前者具有高的导磁率和高的饱和磁感应，在中频和低频范围具有较低损耗。磁芯的形状很多，如EI型，E型，EC型等 导线材料—漆包线：一般用于绕制小型电子 ...

ABSTRACT: To govern, minority presidents in fragmented parliaments deploy both formal and informal coalition-building methods. While the former involves endowments such as agenda-setting power, the ...