propane is 8 times more expensive than natural gas by

來源: FHZM 於 2012-11-08 11:01:11 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (29 bytes)

回答: 樂垚求教，投壇有沒有人家裏用propane instead of natural gas? 由樂垚於 2012-11-08 10:38:25

cost per heating unit.

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