题型:填空题 标有“6V 6W”的灯泡L1和“6V 3W”的灯泡L2串联接入电路中.L1灯丝的阻值是______Ω,通过两灯的电流之比是______,两灯在相同时间内消耗的电能之比为______.(不考虑温度对灯丝电阻的) 查看答案
题型:选择题 They____ have arrived at lunchtime but their flight was delayed.[ ]A. will B. canC. must D. should 查看答案