【单选题】Monopolistic competition and perfect competition differ because
A.
only monopolistically competitive firms will set MR = MC.
B.
only perfectly competitive firms will set MR = MC.
C.
only monopolistic competition allows for entry of other firms in the long run.
D.
only competitive firms take the price as given.
【单选题】以下不属于多元醇型非离子表面活性剂的多元醇的是()。
【单选题】下列关于物流的说法不正确的是( )
C.
为了满足顾客而对原材料、半成品、成品及其相关信息从产地到消费地有效率的移动和保管进行计划、实施、统管的过程
D.
从物流的定义可以知道,通过运输、储存、装卸、搬运、包装、流通加工、配送信息处理等基本功能,物流活动可以实现物品包括空间对时间的位置移动以及形态性质的变动
【单选题】In perfect competition,
A.
producer surplus is less than consumer surplus.
B.
social welfare equals to CS
C.
social welfare is maximized
【单选题】In perfect competition:
A.
The firm’s demand curve is relatively inelastic
B.
The firm’s demand curve is relatively inelastic
C.
The firm’s demand curve is perfectly elastic
D.
The firm’s demand curve is perfectly inelastic
【单选题】下面是关于基因型现表现型关系的叙述,其中错误的是 [ ]