Cleaning and tightness test should be done about correlation piping.
Cleaning and tightness test should be done about correlation piping.
3相关管路清洁完毕，并经过密性试验、验收结束。
Cleaning and tightness test should be done about correlation piping.
3相关管路清洁完毕，并经过密性试验、验收结束。