Florence Nightingale was an excellent ______, and she founded a Nightingale ____ for the nurses all over the world.
A:nurse; prize
B:nurse; party
C:doctor; award
D:doctor; prize
下列有关经线和纬线的说法,错误的是( )
Grandpa! Look _____ my picture.
取一定量的氧化铁与氧化铜的混合物,加入200g质量分数为4.9%的稀硫酸,恰好完全反应生成盐和水.原混合物中氧元素的质量是( )