The second piece of luck is that all over the Earth there is a constant vertical electrical field.
第二个比较幸运的地方是，遍布全世界的范围内都有一个恒定的垂直磁场。
The formula of constant voltage and constant current field perturbation, modified G-L formula and the formula of electrical field perturbation evoked by sound field are derived.
文中证明了电导率变化引起恒流场和恒压场扰动的基本公式、修正g - L公式以及声场诱发电场扰动公式。
The dielectric constant of insulating vegetable oil is about 1.5 times larger than that of mineral oil, which is helpful to improve an uneven distribution of electrical field in oil-paper insulation.
而且具有良好的电气性能，其介电常数大约是矿物绝缘油的1.5倍，有利于改善油纸绝缘结构中电场分布不均的问题。
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