题型:填空题 I five days _______ pictures around the old city. A. spent; taking B. spent; to take C. took; taking D. take; take 查看答案
题型:填空题 两电阻a、 b各自的电流与两端电压的关系图线如图甲所示,(1)电阻a的阻值多大?(2)如果把a、b两个电阻串联接成如图乙所示的电路时,电流表的示数为0.2A. 求: ①电阻b的电功率.②电阻a、b在lmin内消耗的电能之和. 查看答案