Sealed combustion oil furnaces use A) Special sealed air-tight ...

[Pea0909berry]

Sealed combustion oil furnaces use
 
  A) Special sealed air-tight barometric draft regulators
  B) A separate bottled oxygen supply for cleaner combustion
  C) No vent because the combustion chamber is sealed
  D) High static oil burners

Question 2

The best method to prepare a cast iron weld joint is:
 
  A) Machining B) Grinding C) Sawing D) All of the above

[Hikerman221]

Answer to Question 1

D

Answer to Question 2

A

[Pea0909berry]

TYSM

[xiaomengxian]

Thanks for the timely response, appreciate it