Two directional stop is necessary to gearbox's design of power-driven winching at electric power industry.
实现止动是电力机动绞磨用变速箱设计必须满足的工作要求。
Due to excellent stop band and slow wave characteristics, they are applied to filters, resonators, directional couplers, diplexers and antennas.
由于其优良的带阻、慢波等特性，它们被广泛地应用于滤波器、谐振器、定向耦合器、双工器和天线中。
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