短語詞組短語discharge spark gap 放電球隙narrow discharge gap 窄間隙spark -discharge gap 火花放電間隙discharge of vacuum gap 真空間隙放電neutral point discharge gap 中性點放電間隙cancel discharge gap current protection 取消放電間隙電流保護servo control of discharge gap 放電間隙伺服控制servo control for discharge gap 間隙伺服控制gap discharge 間隙放電 返回 discharge gap