A:①②③④
B:①②④
C:①②③
D:②③④
—Could you please offer me a job in your company?
—Sorry,I'm afraid it's beyond my________.
灯泡L1、L2串联, 用电流表测得灯L1的电流是0.3 安, 则 通过灯L2的电流为:()