(2015•南昌)如图所示,电源电压恒定,小灯泡上标有“2V 1W”的字样,滑动变阻器R2的最大阻值为50Ω,求:
地球上终年炎热的地区是( )
1921-1925年苏俄(联)粮食产量(注:普特=16.8千克)
—Of course, it's built over a canyon in the Zhangjiajie National Forest Park.