Kev yuav khoom

Cov khoom

Kev lag luam

6

Fais fab kev lag luam piping

7

Roj thiab roj piping thiab yeeb nkab kab

9

Kev lag luam tshuaj yeeb nkab thiab kav dej

10

Boiler kev lag luam yeeb nkab thiab kav dej