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【单选题】
回声测深仪的测量深度与下列哪些因素无关？A.
发射触发重复周期
B.
触发脉冲宽度
C.
发射功率
D.
发射触发方式
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反馈参考答案：
举一反三
【单选题】In the long run a perfectly competitive firm operates ____ and a monopolistically competitive firm operates ____.
A.
at the efficient scale; with excess capacity
B.
at the efficient scale; at the efficient scale
C.
with excess capacity; with excess capacity
D.
with excess capacity; at the efficient scale
【单选题】Which of the following is not a characteristic of a competitive firm?
A.
There are many buyers and sellers in the market.
B.
The goods offered for sale are largely the same.
C.
Firms can freely enter or exit the market.
D.
All of the above are characteristics of a competitive market.
【单选题】关于左后分支传导阻滞的心电图,下列哪项是错误的
A.
电轴右偏≥120°
B.
呈QⅠ、SⅢ型
C.
QRS波群时限0.08～0.10s
D.
肢导联QRS波群低电压倾向
E.
室壁激动时间V6>aVL0.01s
【单选题】As a result of product differentiation, a firm in a monopolistically competitive market:
A.
always has some market power.
B.
is very similar to a firm in a perfectly competitive market.
C.
faces a perfectly elastic demand curve.
D.
is very similar to a monopolist.
【单选题】某大型机械一次性大修理费用为8600元,耐用总台班960台班,大修理间隔台班240台班,则大修理费为()元/台班
A.
26.88
B.
25.64
C.
27.32
D.
35.83
【单选题】Which of the following is true for a monopolist but not for a perfectly competitive firm?
A.
Marginal revenue is less than price.
B.
Economic profits could be earned in the long run.
C.
Profit maximization occurs at the output level where marginal revenue equals marginal cost.
D.
(a) and (b) are true for a monopolist but not for a perfectly competitive firm.
【单选题】对尿路感染病人的健康教育中, 错误的是 A 鼓励病人多饮水, B 长期预防性服用抗生素, C 及时治疗尿路结石, D 及时治疗尿道损伤, E 保持会阴部清洁
A.
B.
C.
D.
E.
E
【单选题】A monopolistically competitive firm chooses its
A.
price and quantity just as a monopoly does.
B.
quantity but faces a horizontal demand curve just as a competitive firm does.
C.
price but can sell any quantity at the market price just as an oligopoly does.
D.
price and quantity based on the decisions of the other firms in the industry just as an oligopoly does.
相关题目：
【单选题】对尿路感染病人的健康教育中, 错误的是 A 鼓励病人多饮水, B 长期预防性服用抗生素, C 及时治疗尿路结石, D 及时治疗尿道损伤, E 保持会阴部清洁
A.
B.
C.
D.
E.
E
参考解析：
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