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【单选题】
切比雪夫不等式表明:随机变量X的方差越小,事件 发生的概率 ,即X的取值基本上集中在期望附近.A.
越大
B.
越小
C.
相等
D.
不确定
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【单选题】肾小球基底膜增厚呈车轨状见于
A.
急性弥漫性增生性肾小球肾炎
B.
弥漫性系膜增生性肾小球肾炎
C.
弥漫性新月体性肾小球肾炎
D.
弥漫性膜性增生性肾小球肾炎
E.
轻微病变性肾小球肾炎
【单选题】肾炎时，毛细血管壁增厚呈车轨状或分层状见于
A.
急性弥漫性增生性肾小球肾炎
B.
弥漫性系膜增生性肾小球肾炎
C.
弥漫性膜性增生性肾小球肾炎
D.
弥漫性硬化性肾小球肾炎
E.
弥漫性新月体性肾小球肾炎
【单选题】Under monopolistic competition:
A.
there are significant barriers to entry.
B.
there are few barriers to entry.
C.
firms sell identical products.
D.
firms face perfectly elastic demand curves.
【单选题】In equilibrium under monopolistic competition:
A.
firms always earn profits in the short run.
B.
firms always suffer losses in the short run.
C.
output is at the socially efficient level in the long run.
D.
marginal revenue is less than price.
【单选题】A firm in long-run equilibrium under monopolistic competition will earn
A.
zero economic profits because of free entry.
B.
positive monopoly profits because each sells a differentiated product.
C.
positive oligopoly profits because each firm sells a differentiated product.
D.
negative economic profits because it has economies of scale.
E.
positive economic profit if it engages in international trade.
【单选题】肾小球基底膜增厚呈双轨状见于
A.
急性弥漫性增生性肾小球肾炎
B.
弥漫性系膜增生性肾小球肾炎
C.
弥漫性新月体性肾小球肾炎
D.
膜增生性肾小球肾炎
E.
轻微病变性肾小球肾炎
【单选题】In equilibrium under monopolistic competition:
A.
marginal revenue exceeds average revenue.
B.
marginal revenue exceeds marginal cost.
C.
marginal revenue is equal to marginal cost.
D.
marginal revenue is less than marginal cost.
【单选题】急进性肾炎的病理类型是
A.
急性弥漫性增生性肾小球肾炎
B.
弥漫性系膜增生性肾小球肾炎
C.
弥漫性膜性增生性肾小球肾炎
D.
弥漫性硬化性肾小球肾炎
E.
肾小球囊新月体性肾炎
【单选题】Product differentiation under monopolistic competition means that each firm:
A.
charges a slightly different price.
B.
has a pure monopoly.
C.
maximizes profit where MC = P.
D.
faces a horizontal demand curve.
相关题目：
【单选题】肾小球基底膜增厚呈车轨状见于
A.
急性弥漫性增生性肾小球肾炎
B.
弥漫性系膜增生性肾小球肾炎
C.
弥漫性新月体性肾小球肾炎
D.
弥漫性膜性增生性肾小球肾炎
E.
轻微病变性肾小球肾炎
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