| 单词 | permeability of free space |
| 释义 | > as lemmaspermeability of free space permeability of free space n. a constant μ0 which in the cgs electromagnetic system of units is one and in the SI System is defined as a base quantity with the value 4π (= 12.57) × 10−7 henry metre−1.extracted from permeabilityn.< as lemmas |
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