e6503375_009__Tanpa_Klasifikasi_Lugansk__3
[0] 154. [1] The impairment of vision can occur in children when carrying out different kinds of work. What main hygienic conditions of labour can provide the prophylaxis of these disturbance? [2] * ensuring the good illumination of a child’s working place [4] the quality of educational books [5] a blackboard colour [6] the distribution of children in the classroom [3] 
the time restriction of fulfilling work
Krok 2009: Tanpa Klasifikasi Lugansk
3