等质量的二氧化碳和一氧化碳中,所含氧元素的质量比为_______。
14:11
—What were you doing at six yesterday evening?
— I _____ in the kitchen. [ ]
A. cook
B. cooked
C. was cooking
D. have cooked
房地产市场指标中,城市家庭总支出指除借贷支出以外的全部家庭支出包括( )。
A.消费性支出
B.确定性支出
C.转移性支出
D.社会保障支出
E.财产性支出