Low-speed wind tunnel installation
环形低速风洞
CTF-Ⅰ  Calibration device of dust concentration instrument    

CTF-Ⅰ  粉尘浓度仪表检定装置

CTF-Ⅱ    Calibration device of dust concentration instrument
CTF-Ⅱ粉尘浓度仪表检定装置

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