通常产业系统内部各行业存在以下关系( ）Which of the following correctly de...
单项选择题通常产业系统内部各行业存在以下关系( ）Which of the following correctly describes the relationship between industry sectors within an industrial system（ ）
A、各行业的生态效率数值大致相同 The eco-efficiency of each industrial sector is roughly the same value
B、各行业的生态效率数值各不相同 The eco-efficiency of each industrial sector is greatly different value
C、各行业的生态效率数值难以估算 The eco-efficiency of each industrial sector is difficult to be estimated
D、各行业的生态效率数值毫无管理用途 The eco-efficiency value of each industrial sector is useless in management
