A:360g C60晶体中的分子数为NA
B:标况下,11.2L SO3所含的分子数目为0.5NA
C:0.1mol/L稀硫酸中含SO42-离子个数为0.1NA
D:0.1mol CH5+所含的电子数目为NA
请按代数式10x+30y编写一道与实际生活相关的应用题.
—Yes, I just bought _______ the other day.