.thank very much.

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.thank very much.
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.thank very much.
.thank very much.
 

.thank very much.
1.不需要 最大 3×10^8
2.ABCDF E
3.反射 遵循
4.沿直线传播
5.入射光线 可逆的
6.0度 0度 20度 40度

thank u very much~ thank you very much Thank you very much. Thank you very much Thank you very much, thank you very much Thank you very much! Thank very much! thank very much! .thank very much. thank very much thank you very much 英语翻译thank you very much 英语翻译thank you very much~ Thank you very much!翻译 急用,Thank You very much. Thank you very much回答 英语翻译Thank you very much