题目

铜、镁合金4.6g完全溶于浓硝酸，若反府中硝酸被还原只产生4480mL的NO2气体和336mLN204气体(气体均为标况)，在反应后的溶液中加入足量的NaOH溶液，生成沉淀的质量为A  7.04g        B  8.26g          C  8.51g         D  9.02g 答案：CAfter playing football for more than half an hour, the students took ______ rest.A.a ten--- minuteB.a ten minute’sC.a ten-minutes’ D.a ten-minute’s