-- ?
-- It's orange.
A:Is it an orange
B:Whose orange is it
C:What colour is the orange
D:Where is the orange
已知i是虚数单位,m,n∈R,且m+2i=2﹣ni,则m+nim-ni的共轭复数为____
①2个硫原子____;②氯酸钾中的阳离子____;
③“Fe2+”中数字“2”表示的意义是____;
④2个五氧化二磷分子____;⑤最简单的有机物____.