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加拿大萨斯喀彻温大学的工程师们研制出一种旋转式电液流量控制阀。萨斯喀彻温大学的二位工程师研制出一种造价便宜的旋转式电液流量控制阀(图1和图
Engineers at the University of Saskatchewan have developed a rotary electro-hydraulic flow control valve. Two engineers at the University of Saskatchewan developed a cheaper rotating electro-hydraulic flow control valve (Figure 1 and Figure