Metal valves for use in flanged pipe systems - Face-to -face and centre-to-face dimensions
法兰连接金属阀门 结构长度;
法兰联接金属阀门 结构长度;
Metal valves for use in marine flanged pipe systems--Face-to-face and centre-to-face dimensions
船用法兰连接金属阀门的结构长度;
Nature and Human and Human Being Society
自然人和人类社会;
Human Environment and Human Ecology
人类环境与人类生态学;
Human and Nature in the Eyes of Marx and Engel--Viewpoints of Environmental Protection Law in the Effect of Labor From Ape to Human
马克思、恩格斯眼中的人与自然--《劳动在从猿到人转变过程中的作用》中的环保法思想;