单项选择题
锅炉供风量应略大于完全燃烧时理论所需空气量，因为_________。 A...
单项选择题锅炉供风量应略大于完全燃烧时理论所需空气量，因为_________。 A. 需降低炉膛温度 B. 需加大风速以利燃油蒸发 C. 燃油与空气混合难以完全均匀 D. A和B和C
政府给残疾人发放救济金要计入国内生产总值 A、正确 B、错误
单项选择题政府给残疾人发放救济金要计入国内生产总值 A、正确 B、错误
An example of race is brown, white, or black skin, whil...
问答题An example of race is brown, white, or black skin, while an example of ethnicity is German or Spanish ancestry (regardless of race). One’s race is determined by ____________
