00522naa#a2200169#i#450# EN\INFRA-M\bibl\3853 20260118031441.7 2306-1731 20140910b2014####ek#y0engy0150####ca RUS RU Prospects of Polytechnic Principle of Learning in Technological Training of Pupils of 5-7 Grades Journal article Moscow INFRA-M Academic Publishing LLC. 2014 2 с. Journal article local Terentyev Sergey naukaru.ru