题目

入射光与镜面的夹角为30°,则反射光线与入射光线的夹角为() A . 30° B . 60° C . 90° D . 120° 答案:D –My brother and I will go to the library tomorrow.-______. Shall we go together?A. So am I B. So do I C. So I am D. So will I
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