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根据以下资料,回答下列各题:某铁路局2008年矿石的平均是500公里,每吨公里的运输支出为8分,其中始发到达作业费占20%,中转和运行作业费占80%;2009年矿石供求情况发生了变化,矿石的平均增加到600公里;预计2010年矿石的平均为550公里。始发到达作业费和其他有关情况均保持不变。 随着矿石平均增加,单位运输支出中的始发到达作业费将( )。
A.
不变
B.
增加
C.
减少
D.
先增加后减少
E.
先减少后增加
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