Hot water boilers (home heating system).
热水锅炉(家用取暖系统)。
Which is the most economical fuel for home heating-gas, electricity, or oil?
哪一种燃料用作家庭暖气最经济煤气、电力还是汽油？
Ordinary people don't have heating at home.
一般人家里都没有暖气。
Do people in Beijing have heating at home?
北京人家里有没有暖气？
Do people in Beijing have heating at home?
北京人家里有没有暖气？
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