单选题:物流业发展进程的第三阶段为物流系统服务阶段,其量化特征是运输收入所占的比重为( )。

题目内容:
物流业发展进程的第三阶段为物流系统服务阶段,其量化特征是运输收入所占的比重为( )。 A.70%以上
B.50%~70%
C.30%~50%
D.不超过30%

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