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to phrases
secondary standard
avia. 工作标准
el. 二次标准; 副标准器
el., meas.inst. 次级标准
oil 副基准
space 二级标准; 副标准
tech. 级标准
secondary standard
: 21 phrases in 9 subjects
Air defense2
Aviation1
Chemistry1
Ecology2
Electronics1
Metallurgy2
Rail transport1
Space2
Technology9

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