The switching over-voltage is rising in pace with the raise of the power system grade, which is very harmful to the electrical equipment in the network.
目前，由于系统的电网等级不断提高，操作过电压也随之不断升高，这对电气设备的正常运行造成很大的危害。
2
Usually, switching to the mid-grade or premium-grade gasoline will remove the knock.