The built-in filter of a solenoid valve can be cleaned without dismantling its sleeve, but simply unscrewing its nut to pull out the plastic filtering plate.
本电磁阀自带的过滤器无需拆卸管子即可非常方便的清洗，只需用手拧下螺帽，拔除塑料滤片即可清洗。
A shunt active power filter is applied in the fisher boat in order to suppress the harmonic produced by the sleeve-fish troll machine. The design scheme of the shuntactive power filter is provided.
将并联型有源电力滤波器应用于鱿鱼钓船，抑制鱿鱼钓机这一典型的谐波源工作时对电源造成的谐波污染，并提供了有源电力滤波器的设计方案。
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