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【单选题】
If there are economies of scale throughout the relevant output range of production, which is false?
A.
It is a natural monopoly.
B.
It is more efficient to have a single firm produce the good.
C.
It would typically result from a firm's possession of an exclusive patent.
D.
One large firm can produce at lower cost than two or more smaller firms.
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【多选题】If there happens a large passenger flow, what may station officers broadcast in the station?
A.
Dear passengers, crowded management plants are now in operation. Please follow the directions to exit the station.
B.
Some entry gates are temporarily shut down. We apologize for any inconvenience this might cause.
C.
The station exit service will be suspended because of the big jam. We apologize for any inconvenience this might cause.
D.
We have informed the fender bus system. Passengers go to the assigned bus waiting place at Exit B, and free buses will be available.
【多选题】下列关于服饰礼仪的叙述正确的有()。
A.
正式、隆重、严肃的场合，应穿礼服或深色西服
B.
穿西服时，应平整、挺直，有裤线，衬衣、领带与西装协调一致
C.
一旦进入室内，应脱去大衣、风衣，摘去帽子
D.
若别人赞美你的着装，应该立刻表示否定以示谦虚
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【多选题】If there happens a large passenger flow, what may station officers broadcast in the station?
A.
Dear passengers, crowded management plants are now in operation. Please follow the directions to exit the station.
B.
Some entry gates are temporarily shut down. We apologize for any inconvenience this might cause.
C.
The station exit service will be suspended because of the big jam. We apologize for any inconvenience this might cause.
D.
We have informed the fender bus system. Passengers go to the assigned bus waiting place at Exit B, and free buses will be available.
【多选题】下列关于服饰礼仪的叙述正确的有()。
A.
正式、隆重、严肃的场合，应穿礼服或深色西服
B.
穿西服时，应平整、挺直，有裤线，衬衣、领带与西装协调一致
C.
一旦进入室内，应脱去大衣、风衣，摘去帽子
D.
若别人赞美你的着装，应该立刻表示否定以示谦虚
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