第9题
现有产业系统最符合哪组()特征描述 Which of the following is the most suitable description of current industrial system()
A.所有物质均线性流过产业系统 All material flow linearly through industrial systems###SXB###B.一些物质逐渐形成产业系统中的链状、网状等流动关系 Some materials are gradually linking industrial components as a chain or web in the industrial system###SXB###C.已经形成了物质在产业系统中的封闭循环流动关系 The materials has been enclosed in industrial system###SXB###D.产业系统中不可能形成物质的循环流动关系 It is impossible to form a material cycle in an industrial system
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