12)a
13)a
14)d
15)c
16)d
17)b
18)a
19)d
20)c
Стрнный человек зелёные волосы, тёмная кожа, фиолетовые глаза. Похож на Шерлока...
The term “internal combustion piston engine” referS to engines in which air and gasoline are buRNT inside the metal cylinders and which drive rotating crankshaft by means of piston and connecting rods. Since a great deal of heat IS produced when the gasoline mixture burns or explodes, some means must be provided to CARRY away the excessive heat. According to the cooling system employed the piston engines may BE CLASSIFIED as air-cooled engines and liquid-cooled ones.