举例来说正负号只适用于附加量子数，例如电荷，而不是质量。
The sign reversal applies only to quantum numbers (properties) which are additive, such as charge, and not to mass, for example.
由于沉积在静电除尘器收尘极板上的高比电阻粉尘层会产生电荷积累而形成附加电场。
The mathematical models of the charges and the additional electric field in the changed dust layer are developed by the electrostatics.
由于沉积在静电除尘器收尘极板上的高比电阻粉尘层会产生电荷积累而形成附加电场。
The mathematical models of the charges and the additional electric field in the changed dust layer are developed by the electrostatics.
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