平行光管是光学实验及计量检测的重要设备。
The collimator is an important equipment for optical experiment and standardization.
2015年世界计量日的中国宣传主题与国际主题一致，为“计量与光”。
China's propaganda theme of 2015 is in line with international theme for.
2015年世界计量日的中国宣传主题与国际主题一致，为“计量与光”。
China's propaganda theme of 2015 is in line with international theme for.
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