A:否则/那么消灭违反
B:如果/还消亡违反
C:如果/还消灭违犯
D:否则/那么消亡违犯
— She is hard-working. She ________ all her effort into her work before she got ill.
如图1所示是电阻R1与滑动变阻器R的电路图,电源电压为12V,电阻R1的I﹣U图象如图2所示.开关闭合后,滑动变阻器R接入电路的阻值为40Ω时,求:
4+58=____
9+27=____
31+15=____
15+17=____
4+38=____
29+57=____
46+15=____