A:f(t)有最小值 16 + 3π
B:f(t)有最大值 16 + 3π
C:f(t)有最小值 14 + 2π
D:f(t)有最大值 14 + 2π
如图是小明同学探究电流产生的热量与电阻关系的实验装置,在A、B两个相同的烧瓶中分别装有质量和初温都相同的煤油,两根电阻丝分别为等长等粗的铜丝和镍铬合金丝,请你解答:
—The cost of food and clothing is going up nearly every day.
—Yes, the price of vegetables is much than before.