Your home town is really nice! The air quality is as good as______of Sanya.
A:it
B:one
C:that
D:the one
称取铜、锌混合物10克置于烧杯中,慢慢加入稀硫酸使其充分反应,直至固体质量不再减少为止,此时用去49克稀硫酸,剩余固体3.5克,计算:
下列现象中,属于光的折射现象的是()