谢谢，你这个是对的。请教一下“then evacuate -pressure hold, add back the us

来源: 于 2023-07-11 17:21:52 [旧帖] [给我悄悄话] 本文已被阅读：次

then evacuate -pressure hold, add back the used refrigerant,

why Pressure Hold? after evacuate.

Thank you.