1. expansion joint
2. vent pipe
3. loose jumper stop cock
唔知有無人可以解答我呢....thx~!
更新1:
回下面...頭兩個應該係....但第三個就....有無更加準確既解釋...怪怪地咁
回下面...頭兩個應該係....但第三個就....有無更加準確既解釋...怪怪地咁
收錄日期: 2021-04-23 13:13:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070715000051KK02307