彩色的视觉后像是
A．与原像明暗相同
B．比原像光度暗淡
C．原像颜色的补色
D．与原像颜色相同
E．比原像更明亮些
参考答案：C
—May I use your dictionary? Mine is at home.
—______.[ ]
A. Thanks a lot
B. I'd love to
C. You're welcome
D. Sure. Here you are
如何定义磁感应强度？
