A:①
B:②③
C:③④
D:②
雾霾含有大量的污染物SO2、NO.工业上变“废”为宝,吸收工业尾气SO2和NO,可获得Na2S2O4和NH4NO3产品的流程图如图1(Ce为铈元素):
—It's Mid-autumn Day today. Don't forget to give my best wishes to your family.
—__________. Thank you very much.
12-____=7。