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【单选题】
1999年11月20日我国第一艘载人航天试验飞船( )发射成功。A.
嫦嫩号 ”
B.
奔月号
C.
神州号 ”
D.
神舟号”
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举一反三
【单选题】When new firms choose to enter monopolistically competitive markets:
A.
there must be little diversity of products in the market.
B.
they are guaranteed economic profits upon entry.
C.
some firms in the market must be making economic profits.
D.
the demand curve faced by an established firm will shift to the right as a result.
【单选题】关于发动机机油消耗超标的原因,下列说法不正确的是()
A.
活塞、活塞环与缸壁磨损严重,造成配合间隙过大所致
B.
气门油封损坏所致
C.
活塞环与活塞环槽磨损严重,导致窜机油
D.
燃油压力过高所致
【单选题】When new firms have an incentive to enter a competitive market, their entry will
A.
increase the price of the product.
B.
drive down profits of existing firms in the market.
C.
shift the market supply curve to the left.
D.
increase demand for the product.
【单选题】Which of the following does not happen when new firms enter a monopolistically competitive industry?
A.
The demand curve for each of the existing firms will fall.
B.
The demand curve for each of the existing firms will move inward.
C.
The demand curve for each of the existing firms will becomes relatively more elastic.
D.
The demand curve for each of the existing firms will shift to the right.
【单选题】In the long run, new firms will enter a perfectly competitive market when firms in the market are _______.
A.
making zero economic profit
B.
increasing output in order to maximize profit
C.
incurring economic losses
D.
making positive economic profits
E.
shutting down temporarily to reduce their economic losses
【单选题】关于发动机机油消耗超标的原因,下列说法不正确的是()。
A.
活塞、活塞环与缸壁磨损严重,造成配合间隙过大所致
B.
活塞环与活塞环槽磨损严重,导致窜机油
C.
气门油封损坏所致
D.
燃油压力过高所致
【单选题】关于发动机机油消耗超标的原因,下列说法不正确的是()。
A.
活塞、活塞环与缸壁磨损严重,造成配合间隙过大所致
B.
气门油封损坏所致
C.
活塞环与活塞环枻磨损严重,导致窜机油
D.
燃油压力过高所致
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