반응형 English ver.6 What is UV C and Ozone(O3)? What is UV C and Ozone(O3)? Learn about sterilization, we have some good data on UV and ozone, and I would like to share it. (Additional review is needed to confirm that the following data is correct through thesis) The blue text is my idea. Please note that this may be wrong. Among the various wavelengths of ultraviolet rays, ultraviolet rays of 253.7 nm have a sterilizing power of 1,600 times .. 2020. 7. 17. YouTube Premium maximum simultaneous access YouTube Premium maximum simultaneous access Many of you will be using YouTube Premium. Of course I am using it too. Even if you haven't used it before, no one has ever used it. When watching a video, it starts and plays the video immediately without seeing any advertisements in the middle, and offline storage as well as playback (with sound) is possible even when the phone screen is off. You can.. 2020. 7. 17. 이전 1 2 다음 728x90 반응형
