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【多选题】
引起呼吸性碱中毒的原因有A.
吸入气中氧分压过低
B.
外呼吸障碍
C.
呼吸中枢直接受刺激
D.
肺部疾患
E.
人工呼吸机使用不当,通气量过大
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反馈参考答案：
举一反三
【单选题】When a monopolist is able to sell its product at different prices to different customers, it is likely engaging in:
A.
quality-adjusted pricing.
B.
price discrimination.
C.
price differentiation.
D.
illegal activities.
【简答题】蒸发器控制阀损坏或调节不当,会造成( )
【单选题】If a monopolist could sell 5 units at $6 and 6 units at $5:
A.
marginal revenue for the 6th unit is $5.
B.
marginal revenue for the 6th unit is zero.
C.
demand is unit elastic over that range of prices.
D.
both (b) and (c) are true.
【单选题】For a single-price monopolist to sell one more unit of a good, it must
A.
lower the price on just the last unit sold.
B.
lower the price on all units sold.
C.
raise the price on just the last unit sold.
D.
raise the price on all units sold.
【单选题】An increase in a monopolist’s average cost will lead to
A.
an increase in price, as the monopolist passes on the price increase
B.
an increase in price only if marginal cost also increases
C.
a decrease in price as the monopolist needs to sell more in order to cover increased costs
D.
an increase in price only if the elasticity of demand is less than 1.0
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