问题
填空题
一束光线与镜面成30°角入射，那么反射光线与入射光线夹角是_________，将入射光线与镜面间夹角增大10°，那么入射角为________，反射角为___________。
答案
120° 50° 50°
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一束光线与镜面成30°角入射，那么反射光线与入射光线夹角是_________，将入射光线与镜面间夹角增大10°，那么入射角为________，反射角为___________。
120° 50° 50°
Everyone 1 tired sometimes. When you are tired, You should follow the doctor’s advice. First, you should go to bed early 2 a few nights. You shouldn’t 3 at night or study 4 . Having a good rest 5 good for your health. Second, you should 6 every day. Third, you should eat fruit and other 7 ,and it’s important 8 a balanced diet .Don’t 9 stressed out , or it makes you sick. You should 10 some music . You shouldn’t study when you are tired . If you take the advice above , you’ll be a healthy person.
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