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    Solar energy heating system is an method of heating. A. economic B. economy C. economics D. economical 【查看更多】

     

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    Solar energy heating system is an _____ method of heating.

     A. economic      B. economy       C. economics      D. economical

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    （2010·吉林长春外国语学校高三上第一次月考）   13. Solar energy heating system is an _____ method of heating.

     A. economic      B. economy       C. economics       D. economical

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