туузан дамжуулагч засвар
Maintenance and repair Үйлчилгээ ба засвар. 2012 3 21 Maintenance and repair Үйлчилгээ ба засвар There are no definite line of division between maintenance and repair It is usual to say that maintenance includes items such as cleaning inspection adjustment routine replacements and hard face or other build up welding while repair …