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【单选题】
男,32岁,因重度烧伤急诊入院。2天后患者出现水样腹泻,并解柏油样便3次,伴腹胀。大便潜血试验(OB):(++++)。内镜检查:在胃底前后壁、十二指肠球部有多发性溃疡出血灶,呈斑点状,大小不等,表面有活动性出血。该患者出现消化道多发性溃疡出血的最主要机制是A.
酸中毒
B.
胃粘膜缺血
C.
胃粘膜屏障遭到破坏
D.
胆汁逆流
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举一反三
【单选题】A monopolist faces a constant marginal cost of $1 per unit. If at the price he is charging,the price elasticity of demand for the monopolist's output is -0.5, then:
A.
the price he is charging must be 2.
B.
the price he is charging must exceed 2.
C.
the price he is charging must be less than 2.
D.
the monopolist can not be maximizing profits.
【单选题】monopolist faces a constant marginal cost of $1 per unit. If at the price he is charging,the price elasticity of demand for the monopolist's output is -0.5, then:
A.
the price he is charging must be 2.
B.
the price he is charging must exceed 2.
C.
the price he is charging must be less than 2.
D.
the monopolist can not be maximizing profits.
【判断题】If an upstream monopolist sells to a downstream monopolist, the price to consumers will be higher than the competitive price, but not so high as it would be if the downstream monopolist took control o...
A.
正确
B.
错误
【简答题】综合评价指标体系包括多个层次设立的指标，指标的设立要与目标所处的层次相关。这体现了评价指标的设立应遵循（ ）原则。
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