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【单选题】
Barriers that prevent the entry of new firms may arise because:A.
economies of scale exist over a substantial range of industry demand.
B.
marginal revenue is less than average total cost.
C.
the government protects some firms from competition.
D.
of both (a) and (c).
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【简答题】真空断路器的动、静触头安装在()内。 A、密封空气容器 B、密封金属容器 C、真空灭弧室
【单选题】—Your father’s birthday is coming. Why don’t you get him a pair of glasses? —_______. Glasses can help him see better.
A.
That’s too boring.
B.
That’s not creative enough.
C.
That sounds great.
D.
That’s not necessary.
【单选题】---Why don’t you get her a scarf? --- _______.
A.
It’s scary
B.
That’s too expensive
C.
It’s so impolite
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