4th Class A12: Elements of Boiler Systems

a

a

a

a

d

c

c

a

d

b

b

a

b

a

d

c

c

b

c

d

d

a

d

b

b

c

a

b

b

b

c

c

a

a

c

a

a

a

b

a

d

b

b

a

d

a

c

b

b

a

c

b

a

a

b

a

c

d

c

b

d

a

a

a

a

c

a

b

c

c

a

b

b

a

a

b

c

b

c

b

b

a

a

c

a

a

c

b

d

a

a

b

a

a

a

b

b

a

b

d

c

c

a

b

a

c

b

a

c

a

c

a

a

a

c

a

c

d

a

d

a

c

a

a

b

a

d

a

a

b

b

b

b

d

c

a

a

b

a

d

a

a

c

a

a

c

d

b

a

b

b

a

c

b

d

c

c

c

c

d

b

d

a

b

b

b

a

b

a

c

c

a

b

b

d

b

c

d

d

c

a

a

c

a

c

b

c

a

a

d

d

a

c

b

d

c

b

b

d

b

a

c

c

a

a

a

b

d

a

d

b

b

c

d

d

a

d

a

b

c

b

c

c

c

c

b

c

d

a

d

b

b

c

a

a

c

a

a

a

d

d

c

c

c

b

d

a

c

d

a

b

c

d

d

d

b

b

a

c

a

1
2
3

d

d

b

b

d

b

a

d

c

d

a

a

b

c

b

c