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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 defense
2
Aviation
1
Chemistry
1
Ecology
2
Electronics
1
Metallurgy
2
Rail transport
1
Space
2
Technology
9
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