Ka la 25 Loetse 2019, ka letsatsi la tsoalo la bo-70 la naha ea bo-'m'e, Duan Yuning, mongoli oa mokha le motlatsi oa Mopresidente oa Setsi sa Naha sa Metrology, China, Yuan Zundong, Tekanyo e ka Sehloohong, Wang Tiejun, motlatsi oa motsamaisi oa Thermal Engineering Institute. , Jin Zhijun, Mongoli Gene...
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