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The graph in the cross-section of the laser rod is drawn according to distributions of each ray., 从光强的分布图可以看出，激光棒内光强的分布均匀。

Methods Investigating visual acuity of 574 students in high schools and colleges aged from 18~25 years old by normal visual ...

The clip then spreads like wildfire, presented as an amusing blooper sent from phone to phone, posted on the internet ore - ...

It’s too easy to believe that they deserve the opprobrium that’s thrown at them, even if some of them create jobs and invent ...