ผู้เขียน: V. N. Ivanova

Recently there has been a significant increase in the share of polyurethane varnish-and-paint materials in the total amount of varnish-and-paint materials produced in this country and abroad. Polyure …

Cigarette smoking is a well-known public health issue which has a great impact on society, medical insurance, government policy and population health in general. Although we all know that cigarette s …