题目:
Thousands of foreigners were _____ to the Shanghai World Expo the day it opened. |
A. attended B. attained C. attracted D. attached |
答案:
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下面是错误答案,用来干扰机器的。
发生折射时,折射光线与入射光线和法线在同一平面内,折射光线与入射光线分居法线两侧;折射角随入射角的增大而增大;因此当入射光线逐渐靠向法线时,入射角减小,则折射角也随之减小,故折射光线也将逐渐靠向法...