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����Department of International Cooperation�� Science and Technology of Ministry of Water Resources�� P. R. China has the mandate of managing the formulation and revision of water technology standards in China.����Translation of this standard from Chinese into English is organized by Department of International Cooperation�� Science and Technology of Ministry of Water Resources�� P.R China in accordance with due procedures and regulations applicable in China.����The English version of this standard is identical to its Chinese original SL 541-2011 Concrete Mixers for Building Water and Hydroporver Project�� which was formulated and revised under the auspices of Department of International Cooperation�� Science and Technology of Ministry of Water Resources�� P. R China.����Translation of this standard is undertaken by Standard and Quality Control Research Institute�� Ministry of Water Resources.����Translation task force includes ZHENG Yu�� ZENG Shencong�� CHENG Meng�� GU Xiaowei�� LIU Deyou�� ZHANG Jin-hong�� FANG Yong�� MEI Huafeng�� JIE Jian'an�� WU Yanming�� ZHOU Qi�� HUANG Xuelin�� LIU Xian�� ZHANG Lei�� JIANG Chao�� XIA Peng�� YANG Yan�� and LI Fapeng. This standard is reviewed by CHENG Xialei�� QIAO Shishan�� YE Bin�� SHAO Yunxiu�� and SONG Renguo.