下列各组物质混合后能发生离子反应的是( )
A:硫酸溶液与硝酸钾溶液混合
B:氯酸钾与二氧化锰混合后加热
C:铁与稀硫酸
D:氢气与氧气混合后点燃
—The weather turns out to be fine.
— We can depend on ___ that the goods will be shipped to the flooded area on time.
几只串联的水果电池提供的电力足够点亮排成V字形的一组发光二极管.
I like the music that I can dance .