题目

Sometimes I really doubt whether there is love between my parents. They are very busy working to____the family. They don’t act in the romantic ways that read in books or I see on TV. Sending flowers to each other on Valentine’s Day is even more __. Finally,when my father is very tired from hard work, it is easy for him to lose his temper（发脾气）.One day, my mother was sewing quilt（被子）. I___ sat down beside her and looked at her Mom, is there love between you and Dad? I asked her in a low voice. My mother stopped and raised her head with___ in her eyes. She didn’t answer im如图所示电路，电源电压不变，R1、R2是定值电阻，若开关S闭合，电流表的示数为1.8A，电阻R2消耗的用功率为3.6W；若开关S断开，电流表的示数为1.2A，求：电阻R1和R2的阻值各为多少？