According to Kirk Smith, the previous plan of clean stovesA.was too ideal B.required more effort C.waited for opinions D.should ignore technology 请帮忙给出正确答案和分析,谢谢!
According to recent researches, switching timeA.may save energy B.makes no difference C.probably wastes energy D.improves work proficiency 请帮忙给出正确答案和分析,谢谢!