Huadian Technology ›› 2019, Vol. 41 ›› Issue (10): 48-52.
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1.Standard and Quality Control Research Institute,Ministry of Water Resources，Hangzhou 310012,China；2.Zhengzhou Hydraulic Machinery Company Limited，Zhengzhou 450042，China; 3.Zhengzhou CR Gas Company Limited，Zhengzhou 450000，China
