你去看激光原理：）想象激光从四面吸收的能量为啥能从一个方向射出？

来源: qiasini 于 2011-11-19 11:23:22 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.