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自由空间磁导率 zìyóu kōngjiān cídǎolǜ
el. permeability of free space
自由空间磁导率合理的= 4π x 10-7亨利/米 zìyóu kōngjiān cídǎolǜ
phys. permeability of free space rationalized
自 由空间磁导率: 1 phrase in 1 subject
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