现有产业系统最符合哪组（）特征描述 Which of the following is the most suitable description o
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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
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
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
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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ABCD