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région D stresses
astronaut.	слой D (ионосферы)

région D: 162 phrases in 36 subjects

Antennas and waveguides	1
Astronautics	10
Astronomy	3
Automated equipment	5
Aviation	10
Business	1
Chemistry	1
Computers	1
Construction	6
Economy	3
Electronics	1
Finances	1
Food industry	1
Formal	2
General	11
Genetics	8
Geology	11
Information technology	9
Mathematics	9
Medical	1
Meteorology	9
Military	2
Name of organization	3
Natural resourses and wildlife conservation	4
Nuclear physics	1
Oil and gas technology	3
Physics	4
Politics	1
Radio	1
Rail transport	1
Spectroscopy	1
Statistics	1
Technology	12
Trucks/Lorries	2
United Nations	21
Радиоактивное излучение	1