如图1所示,已知小灯泡L上标有“6V 3W”字样,R0=20Ω,滑动变阻器R的最大阻值为100Ω.求:
图1 图2
氨气是一种重要的化工产品,工业上可以按照下图所示流程生产氨气:
It is ____(belief) that the place will become a paradise if people live in peace.