IEC 60027-2A:1975由澳大利亚标准协会 AU-SA 发布于 1975-01-01,并于 1975-01-01 实施。
Chapter V: Quantities concerning waveguide propagation; Chapter IX: Letter symbols for scattering matrix and transfer matrix; Chapter X: Symbols for use in the field of static convectors using tubes or semiconductor devices; Chapter XI: Automatic control science and technology.
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