题目

按听到的顺序给下列句子排序。() Nice to meet you, Amy. () I'm from Canada.() This is my friend, Amy.() Where are you from? () Nice to meet you, too. 答案：【1】2【2】5【3】1【4】4【5】3一只电烙铁的额定电压是220V，额定电流是2A，求①这只电烙铁在额定电压下工作时的电阻为多少？②它的额定功率有多大？③在额定电压下通电10min消耗多少电能？