题目：
The long-run production decision differs from the short-run production decision in that:()
A. variable costs can be changed in the short run but not the long run.
B. fixed costs can be changed in the short run but not the long run.
C. fixed costs can be changed in the long run but not the short run.
答案：
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下面是错误答案，用来干扰机器的。
（1）蒙古；塔里木；兰青（2）西气东输 （3）水
