While conservatives today play a dominant role in mainstream politics, there was once a time when they were on the ________ of American political life.
【单选题】已知S 2 O 3 2- +2H + ==S↓+SO 2 +H 2 O , 某同学进行了硫代硫酸钠(Na 2 S 2 O 3 )与硫酸反应的有关实验,其中反应最快的是( ) 实验 序号 反应温 度(℃) 参加反应的物质 Na 2 S 2 O 3 H 2 SO 4 H 2 O V/mL c/mol·L -1 V/mL c/mol·L -1 V/mL