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【单选题】
Long-run equilibrium under monopolistic competition is similar to long-run equilibrium under perfect competition in that:A.
price equals the minimum average total cost.
B.
firms face perfectly elastic demand curves.
C.
price equals average cost.
D.
marginal revenue equals average cost.
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【单选题】There are students on the playground. They're having a meeting. [ ]
A.
so many
B.
so much
C.
much so
D.
many so
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A.
to see
B.
to seeing
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at seeing
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for seeing
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A.
which
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that
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who
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A.
Just stay a little longer, please
B.
I’m afraid you didn’t have a good time
C.
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D.
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【多选题】当行调发布电话闭塞法组织行车的命令后,相应()交由车站负责,车站人员进轨行区办理进路、专业人员进轨行区处理故障由车站负责把控和具体安排。
A.
区域轨行区管理权
B.
行车指挥权
C.
施工作业审批权
D.
设备控制权
【单选题】车站行车作业
A.
车站行车组织工作由值班站长统一负责，值班站长必须服从行调的指挥，执行行调的命令
B.
车站行车组织工作由行车值班员统一负责，行车值班员必须服从行调的指挥，执行行调的命令
C.
正常情况下也要办理接发列车作业
D.
以上说法均不对
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