有人说“封邦建国”加强了周王室与各诸侯国的经济文化联系,这主要评价的是( )
A:世袭制
B:禅让制
C:郡县制
D:分封制
显微镜放大倍数的计算方法是( )
真正的陆生脊椎动物是( )
- How long does it take to get to the airport?
- Forty minutes. But it's foggy today. I'm not sure _________ the highway will be closed soon. Let's set off earlier.