题目

听下面一段较长对话，回答以下小题。【1】What is the relationship between the speakers?A.Workmates. B.Brother and sister. C.Husband and wife.【2】What is the woman going to do?A.Meet some customers.B.Prepare for a party.C.Meet her college friends.【3】What does the man suggest the woman wear?A.A purple dress. B.White shoes. C.A white diamond necklace.【4】Where will the man go first?A.To his company. B.To a school. C.To his parents’ home.20．含R，L的线圈与电容C串联，已知线圈电压URL=50V，电容电压UC=30V，总电压与电流同相，试问：总电压是多少？