Thank you for ____ (show) us around your school.
小丽用伏安法测量电阻R的阻值时，电压表和电流表的示数如图所示，则电压为 ____ V，电流为____ A．电阻R的阻值为____ Ω．
Wendy is manager of customer service at ABC Products. She received the following letters from customers. Read the letters and answer the questions.
已知甲、乙、丙三个旅行团的游客人数都相等，且毎一个旅行团游客的平均年龄都是35岁，这三个旅行团游客年龄的方差分别是S甲2=17，S乙2=14.6，S丙3=19，如果你最喜欢带游客年龄相近的旅行团，若在三个旅行团中选一个，则你应选择（ ）
