This is the most convenient reference level for most electrostatic problems.
对大多数的静电问题来说，这是最方便的参考点。
The formulas are simple and convenient, and may serve as a reference for structural design.
该公式简单、实用、方便，可供设计人员结构设计时参考。
The formulas are simple and convenient, and may serve as a reference for structural design.
该公式简单、实用、方便，可供设计人员结构设计时参考。
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