[HYGIENIC EVALUATION OF STUDY- AND INDUSTRIAL TRAINING-PERIODS IN THE 9TH GRADE].
D000124:Achievement; D000293:Adolescent; D035843:Biomedical Research; D005221:Fatigue; D006801:Humans; D007221:Industry; D010809:Physical Fitness; D012572:School Health Services; D014586:USSR; D014829:Vocational Education
ACHIEVEMENT; ADOLESCENCE; CLINICAL RESEARCH; FATIGUE; PHYSICAL FITNESS; SCHOOL HEALTH; USSR; VOCATIONAL EDUCATION
GIGIENICHESKAIA OTSENKA UCHEBNO-PROIZVODSTVENNOGO REZHIMA UCHASHCHIKHSIA 9-KH KLASSOV.