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【单选题】
（）是自己以燃气或燃油、燃煤、电力等为能源，利用燃气壁挂炉、家用锅炉、电加热器、空调等供暖。
A.
热水采暖系统
B.
自供暖
C.
集中式空调系统
D.
分布式空调系统
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status