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。
Usually, switching to the mid-grade or premium-grade gasoline will remove the knock.
通常，切换到中等或以超值的汽油会删除敲。
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