A:IA>IB>IC
B:IA<IB<IC
C:UAC=UAB=UBC
D:UAC=UAB+UBC
小翔同学在学习了物理知识后,知道 ____是离地球最近的一颗恒星;奥斯特发现了“电流周围存在 ____”;在研究串联或并联电路电阻规律,引入总电阻概念,采用了 ____的科学方法.
—Too much homework has made me tired these days, Mr. Wang.
—That's true. But a small tree won't grow into a big tree it experiences lots of winds and rains.
CCTV-7的“人与自然”栏目常播出下面景观图,该景观分布在下列区域中的( )