— Only________ people can afford to travel around the world.
—Not exactly. I heard that a poor student travelled around the world with little money.
A:rich
B:poor
C:strong
如图所示,电源电压恒为12V,电阻R1为20Ω,当开关S闭合后,电压表的示数为8V,求:
光的世界丰富多彩,光学器件在我们的生活、学习中有着广泛应用.下列说法中不符合实际的是( )