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【单选题】
跨局直通旅客列车每运行一个往返必须安排入库检修；单程运行距离在（）及以上的旅客列车，在折返站原则上应安排入库检修。A.
4000km
B.
3000km
C.
2000km
D.
1000km
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举一反三
【单选题】Suppose that a firm in a competitive market has the following cost curves:【图片】Refer to Figure 6-1. The firm’s short-run supply curve is its marginal cost curve above
A.
$1.
B.
$3.
C.
$4.50.
D.
$6.30.
【单选题】Suppose that a firm in a competitive market faces the following revenues and costs:QuantityTotal RevenueTotal Cost0$0$31$7$52$14$83$21$124$28$175$35$236$42$307$49$38Refer to Table 6-2. The firm will n...
A.
4 units.
B.
5 units.
C.
6 units.
D.
7 units.
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