两个电阻 R 1 和 R 2 串联时,消耗的功率分别为 P 1 和 P 2 。已知 P 1 / P 2 =2 ,则 R 1 / R 2 与 U 1 / U 2 的比值分别是()。 A. R 1 / R 2 =2, U 1 / U 2 =1/2 B. R 1 / R 2 =1/2, U 1 / U 2 =2 C. R 1 / R 2 =2, U 1 / U 2 =2 D. R 1 / R 2 =1/2, U 1 / U 2 =1/2
【简答题】The jobs of wildlife technicians and biologists seemed ________ to him, but one day he discovered their difference. A) identical B) vertical C) parallel D) specific