【简答题】根据以下内容,回答下列各题。 10 Ways Obama Could Fight Climate Change [A] One of the biggest surprises of President Barack Obamas inaugural address,on Monday was how much he focused on fighting climate change, spen...
【单选题】10-1. 已知 H 3 PO 4 的 K a 1 = 7.5 ́ 10 -3 , K a 2 = 6.2 ́ 10 -10 , K a 3 = 4.4 ́ 10 -13 ,将 Na 2 HPO 4 和 Na 3 PO 4 溶解在水中,其物质的量浓度相同,此溶液的 [H + ] 应是 A. 7.1 ́ 10 -3 B. 6.0 ́ 10 -8 C. 4.3 ́ 10 -10 D. 4...